diff --git a/moo/kernel/Apex.moo b/moo/kernel/Apex.moo
index 5e2dc3d..d38d96e 100644
--- a/moo/kernel/Apex.moo
+++ b/moo/kernel/Apex.moo
@@ -130,6 +130,12 @@ extend Apex
 		else { self primitiveFailed }
 	}
 
+	(* ------------------------------------------------------------------
+	 * FINALIZATION SUPPORT
+	 * ------------------------------------------------------------------ *)
+	method(#dual,#primitive) addToBeFinalized.
+	##method(#dual,#primitive) removeToBeFinalized.
+
 	(* ------------------------------------------------------------------
 	 * HASHING
 	 * ------------------------------------------------------------------ *)
diff --git a/moo/kernel/System.moo b/moo/kernel/System.moo
index ec3ce33..6eba8ce 100644
--- a/moo/kernel/System.moo
+++ b/moo/kernel/System.moo
@@ -10,6 +10,45 @@
 
 class System(Apex)
 {
+	method(#class) startup(class_name, method_name)
+	{
+		| class ret |
+
+		class := System at: class_name.
+		if (class isError)
+		{
+			System error: ('Cannot find the class - ' & class_name).
+		}.
+
+		## start the gc finalizer process
+		[ self __gc_finalizer ] fork.
+
+		## TODO: change the method signature to variadic and pass extra arguments to perform???
+		ret := class perform: method_name.
+
+		#### System logNl: '======= END of startup ==============='.
+		^ret.
+	}
+
+	method(#class) __gc_finalizer
+	{
+		| tmp |
+
+		while (true)
+		{
+## TODO: exit from this loop when there are no other processes running.
+			while ((tmp := self _popCollectable) notError)
+			{
+				## TODO: Do i have to protected this in an exception handler???
+				tmp finalize.
+			}.
+
+			System logNl: 'gc_waiting....'.
+			Processor sleepFor: 1. ## TODO: wait on semaphore instead..
+		}
+	}
+
+	method(#class,#primitive) _popCollectable.
 }
 
 pooldic System.Log
diff --git a/moo/kernel/X11.moo b/moo/kernel/X11.moo
index ce42503..3eca5b9 100644
--- a/moo/kernel/X11.moo
+++ b/moo/kernel/X11.moo
@@ -300,10 +300,13 @@ class X11.Widget(Object)
 
 	method onPaintEvent: paint_event
 	{
-System logNl: 'Widget...... onPaintEvent YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY.'.
 	}
 
-	method onButtonEvent: event
+	method onMouseButtonEvent: event
+	{
+	}
+
+	method onKeyEvent: event
 	{
 	}
 
@@ -337,23 +340,45 @@ class X11.Label(X11.Widget)
 	method onPaintEvent: paint_event
 	{
 		| gc |
-System logNl: 'LABEL GC...... onPaintEvent YYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYYY.'.
 
 		gc := selfns.GC new: self.
 		[
-			gc foreground: self.fgcolor;
+			gc foreground: self.bgcolor;
 			   fontName: '-misc-fixed-medium-r-normal-ko-18-120-100-100-c-180-iso10646-1';
 			   apply.
+			gc fillRectangle (0, 0, self.width, self.height).
+
+			gc foreground: self.fgcolor; apply.
 			gc drawRectangle (0, 0, self.width - 1, self.height - 1).
-			##gc fillRectangle (0, 0, self.width, self.height).
-			##gc drawLine (0, y, CTRLWIDE, y).
-			##gc drawLine (0, y + CHIGH + 4, CTRLWIDE, Y+CHIGH+4).
 
 			gc drawString(10, 10, self.text).
 		] ensure: [ gc dispose ]
 	}
 }
 
+class X11.Button(X11.Label)
+{
+	method onMouseButtonEvent: llevent
+	{
+		| type x |
+		type := llevent type.
+		if (type == X11.LLEventType.BUTTON_PRESS)
+		{
+			x := self.fgcolor.
+			self.fgcolor := self.bgcolor.
+			self.bgcolor := x.
+			self onPaintEvent: llevent.
+		}
+		elsif (type == X11.LLEventType.BUTTON_RELEASE)
+		{
+			x := self.fgcolor.
+			self.fgcolor := self.bgcolor.
+			self.bgcolor := x.
+			self onPaintEvent: llevent.
+		}
+	}
+}
+
 class X11.Composite(X11.Widget)
 {
 	var children.
@@ -646,8 +671,9 @@ extend X11
 		widget onPaintEvent: llevent
 	}
 
-	method __handle_button_event: event on: widget
+	method __handle_button_event: llevent on: widget
 	{
+		widget onMouseButtonEvent: llevent
 	}
 
 	method __handle_destroy_notify: event on: widget
@@ -664,8 +690,9 @@ extend X11
 		widget close: event.
 	}
 
-	method __handle_key_event: event on: widget
+	method __handle_key_event: llevent on: widget
 	{
+		widget onKeyEvent: llevent
 	}
 
 	method __handle_shell_close: llevent on: widget
@@ -675,7 +702,18 @@ extend X11
 }
 
 
+class Fx(Object)
+{
+	method initialize
+	{
+		self addToBeFinalized.
+	}
 
+	method finalize
+	{
+		System logNl: 'Greate... FX instance finalized'.
+	}
+}
 
 class MyObject(Object)
 {
@@ -706,16 +744,23 @@ class MyObject(Object)
 		comp1 add: (X11.Label new text: '간다'; width: 100; height: 100).
 		comp1 add: (X11.Label new text: 'crayon'; x: 90; y: 90; width: 100; height: 100).
 	##	self.shell1 add: (X11.Label new text: 'xxxxxxxx'; width: 100; height: 100).
-		self.shell1 add: (X11.Label new text: 'crayon'; x: 90; y: 90; width: 100; height: 100).
+		self.shell1 add: (X11.Button new text: '크레용crayon'; x: 90; y: 90; width: 100; height: 100).
 
-		self.shell2 add: (X11.Label new text: 'crayon'; x: 90; y: 90; width: 100; height: 100).
-		self.shell3 add: (X11.Label new text: 'crayon'; x: 90; y: 90; width: 100; height: 100).
+		self.shell2 add: (X11.Button new text: 'crayon'; x: 90; y: 90; width: 100; height: 100).
+		self.shell3 add: (X11.Button new text: 'crayon'; x: 90; y: 90; width: 100; height: 100).
 		self.shell1 realize.
 		self.shell2 realize.
 		self.shell3 realize.
 
 		self.disp1 enterEventLoop. ## this is not a blocking call. it spawns another process.
 		self.disp2 enterEventLoop.
+
+
+
+		comp1 := Fx new.
+		Fx new.
+		Fx new.
+		Fx new.
 	}
 
 	method(#class) main
diff --git a/moo/lib/comp.c b/moo/lib/comp.c
index d46ee80..10d70e7 100644
--- a/moo/lib/comp.c
+++ b/moo/lib/comp.c
@@ -4354,7 +4354,7 @@ static int compile_block_expression (moo_t* moo)
 	{
 		colon_loc = moo->c->tok.loc;
 
-		/* block temporary variables */
+		/* block temporary variables  - argument to blocks */
 		do 
 		{
 			GET_TOKEN (moo);
diff --git a/moo/lib/exec.c b/moo/lib/exec.c
index cf9a09e..c806256 100644
--- a/moo/lib/exec.c
+++ b/moo/lib/exec.c
@@ -89,10 +89,10 @@
 #	define LOG_MASK_INST (MOO_LOG_IC | MOO_LOG_MNEMONIC)
 
 /* TODO: for send_message, display the method name. or include the method name before 'ip' */
-#	define LOG_INST_0(moo,fmt) MOO_LOG1(moo, LOG_MASK_INST, " %06zd " fmt "\n", fetched_instruction_pointer)
-#	define LOG_INST_1(moo,fmt,a1) MOO_LOG2(moo, LOG_MASK_INST, " %06zd " fmt "\n",fetched_instruction_pointer, a1)
-#	define LOG_INST_2(moo,fmt,a1,a2) MOO_LOG3(moo, LOG_MASK_INST, " %06zd " fmt "\n", fetched_instruction_pointer, a1, a2)
-#	define LOG_INST_3(moo,fmt,a1,a2,a3) MOO_LOG4(moo, LOG_MASK_INST, " %06zd " fmt "\n", fetched_instruction_pointer, a1, a2, a3)
+#	define LOG_INST_0(moo,fmt) MOO_LOG1(moo, LOG_MASK_INST, " %06zd " fmt "\n", (moo)->last_inst_pointer)
+#	define LOG_INST_1(moo,fmt,a1) MOO_LOG2(moo, LOG_MASK_INST, " %06zd " fmt "\n",(moo)->last_inst_pointer, a1)
+#	define LOG_INST_2(moo,fmt,a1,a2) MOO_LOG3(moo, LOG_MASK_INST, " %06zd " fmt "\n", (moo)->last_inst_pointer, a1, a2)
+#	define LOG_INST_3(moo,fmt,a1,a2,a3) MOO_LOG4(moo, LOG_MASK_INST, " %06zd " fmt "\n", (moo)->last_inst_pointer, a1, a2, a3)
 #else
 #	define LOG_INST_0(moo,fmt)
 #	define LOG_INST_1(moo,fmt,a1)
@@ -114,6 +114,7 @@ static int send_message_with_str (moo_t* moo, const moo_ooch_t* nameptr, moo_oow
 /* ------------------------------------------------------------------------- */
 static MOO_INLINE int vm_startup (moo_t* moo)
 {
+	MOO_DEBUG0 (moo, "VM started up\n");
 	if (moo->vmprim.vm_startup (moo) <= -1) return -1;
 	moo->vmprim.vm_gettime (moo, &moo->exec_start_time); /* raw time. no adjustment */
 	return 0;
@@ -123,6 +124,7 @@ static MOO_INLINE void vm_cleanup (moo_t* moo)
 {
 	moo->vmprim.vm_gettime (moo, &moo->exec_end_time); /* raw time. no adjustment */
 	moo->vmprim.vm_cleanup (moo);
+	MOO_DEBUG0 (moo, "VM cleaned up\n");
 }
 
 static MOO_INLINE void vm_gettime (moo_t* moo, moo_ntime_t* now)
@@ -556,7 +558,7 @@ static moo_oop_process_t signal_semaphore (moo_t* moo, moo_oop_semaphore_t sem)
 
 		/* [NOTE] no GC must occur as 'proc' isn't protected with moo_pushtmp(). */
 
-		/* detach a process from a semaphore waiting list and 
+		/* detach a process from a semaphore's waiting list and 
 		 * make it runnable */
 		unchain_from_semaphore (moo, proc);
 		resume_process (moo, proc); /* TODO: error check */
@@ -1130,30 +1132,97 @@ static int start_initial_process_and_context (moo_t* moo, const moo_oocs_t* objn
 	 *    send #main
 	 */
 	moo_oop_context_t ctx;
-	moo_oop_association_t ass;
 	moo_oop_method_t mth;
 	moo_oop_process_t proc;
+#if defined(INVOKE_DIRECTLY)
+	moo_oop_association_t ass;
+#else
+	moo_oop_t s1, s2;
+#endif
+	moo_oow_t tmp_count = 0;
 
-	/* create a fake initial context. */
-	ctx = (moo_oop_context_t)moo_instantiate (moo, moo->_method_context, MOO_NULL, 0);
-	if (!ctx) return -1;
+	moo_oocs_t startup;
+	static moo_ooch_t str_startup[] = { 's', 't', 'a', 'r', 't', 'u', 'p' };
+
+#if defined(INVOKE_DIRECTLY)
+	
 
 	ass = moo_lookupsysdic (moo, objname);
-	if (!ass) return -1;
+	if (!ass || MOO_CLASSOF(moo, ass->value) != moo->_class) 
+	{
+		MOO_DEBUG2 (moo, "Cannot find a class - %.*js", objname->len, objname->ptr);
+		return -1;
+	}
 
 	mth = find_method (moo, ass->value, mthname, 0);
-	if (!mth) return -1;
+	if (!mth) 
+	{
+		MOO_DEBUG4 (moo, "Cannot find a method in %.*js - %.*js", objname->len, objname->ptr, mthname->len, mthname->ptr);
+		return -1;
+	}
 
 	if (MOO_OOP_TO_SMOOI(mth->tmpr_nargs) > 0)
 	{
 		/* this method expects more than 0 arguments. 
 		 * i can't use it as a start-up method.
-TODO: overcome this problem 
+TODO: overcome this problem - accept parameters....
 		 */
+		MOO_DEBUG4 (moo, "Arguments not supported for a startup method - %.*js>>%.*js", objname->len, objname->ptr, mthname->len, mthname->ptr);
 		moo_seterrnum (moo, MOO_EINVAL);
 		return -1;
 	}
 
+	moo_pushtmp (moo, (moo_oop_t*)&mth); tmp_count++;
+	moo_pushtmp (moo, (moo_oop_t*)&ass); tmp_count++;
+#else
+
+	startup.ptr = str_startup;
+	startup.len = 7;
+	mth = find_method (moo, (moo_oop_t)moo->_system, &startup, 0);
+	if (!mth) 
+	{
+		MOO_DEBUG0 (moo, "Cannot find the startup method in the system class");
+		return -1;
+	}
+
+	if (MOO_OOP_TO_SMOOI(mth->tmpr_nargs) != 2)
+	{
+		MOO_DEBUG1 (moo, "Weird argument count %zd for a startup method - should be 2",  MOO_OOP_TO_SMOOI(mth->tmpr_nargs));
+		moo_seterrnum (moo, MOO_EINVAL);
+		return -1;
+	}
+/* TODO: check if it's variadic.... it should be. and accept more than 2... */
+
+	moo_pushtmp (moo, (moo_oop_t*)&mth); tmp_count++;
+	s1 = moo_makesymbol (moo, objname->ptr, objname->len);
+	if (!s1)
+	{
+		moo_poptmps (moo, tmp_count);
+		return -1;
+	}
+
+	moo_pushtmp (moo, (moo_oop_t*)&s1);
+	s2 = moo_makesymbol (moo, mthname->ptr, mthname->len);
+	if (!s2)
+	{
+		moo_poptmps (moo, tmp_count);
+		return -1;
+	}
+
+	moo_pushtmp (moo, (moo_oop_t*)&s2);
+#endif
+
+	/* create a fake initial context. */
+	ctx = (moo_oop_context_t)moo_instantiate (moo, moo->_method_context, MOO_NULL, MOO_OOP_TO_SMOOI(mth->tmpr_nargs));
+	if (!ctx) 
+	{
+		moo_poptmps (moo, tmp_count);
+		return -1;
+	}
+
+	moo_pushtmp (moo, (moo_oop_t*)&ctx); tmp_count++;
+
+
 /* TODO: handle preamble */
 
 	/* the initial context starts the life of the entire VM
@@ -1184,17 +1253,20 @@ TODO: overcome this problem
 
 	/* start_initial_process() calls the SWITCH_ACTIVE_CONTEXT() macro.
 	 * the macro assumes a non-null value in moo->active_context.
-	 * let's force set active_context to ctx directly. */
+	 * let's forcefully set active_context to ctx directly. */
 	moo->active_context = ctx;
 
-	moo_pushtmp (moo, (moo_oop_t*)&ctx);
-	moo_pushtmp (moo, (moo_oop_t*)&mth);
-	moo_pushtmp (moo, (moo_oop_t*)&ass);
 	proc = start_initial_process (moo, ctx); 
-	moo_poptmps (moo, 3);
+	moo_poptmps (moo, tmp_count); tmp_count = 0;
 	if (!proc) return -1;
 
+#if defined(INVOKE_DIRECTLY)
 	MOO_STACK_PUSH (moo, ass->value); /* push the receiver - the object referenced by 'objname' */
+#else
+	MOO_STACK_PUSH (moo, (moo_oop_t)moo->_system);
+	MOO_STACK_PUSH (moo, s1);
+	MOO_STACK_PUSH (moo, s2);
+#endif
 	STORE_ACTIVE_SP (moo); /* moo->active_context->sp = MOO_SMOOI_TO_OOP(moo->sp) */
 
 	MOO_ASSERT (moo, moo->processor->active == proc);
@@ -1203,7 +1275,11 @@ TODO: overcome this problem
 	MOO_ASSERT (moo, moo->active_context == ctx);
 
 	/* emulate the message sending */
+#if defined(INVOKE_DIRECTLY)
 	return activate_new_method (moo, mth, 0);
+#else
+	return activate_new_method (moo, mth, 2);
+#endif
 }
 
 /* ------------------------------------------------------------------------- */
@@ -1642,6 +1718,22 @@ static moo_pfrc_t pf_basic_at_put (moo_t* moo, moo_ooi_t nargs)
 	return MOO_PF_SUCCESS;
 }
 
+static moo_pfrc_t pf_add_to_be_finalized (moo_t* moo, moo_ooi_t nargs)
+{
+	/* TODO: check if it has already been added */
+	moo_regfinalizable (moo, MOO_STACK_GETRCV(moo,nargs));
+	MOO_STACK_SETRETTORCV (moo, nargs);
+	return MOO_PF_SUCCESS;
+}
+
+static moo_pfrc_t pf_remove_to_be_finalized (moo_t* moo, moo_ooi_t nargs)
+{
+	/* TODO: check if it has already been added */
+	moo_deregfinalizable (moo, MOO_STACK_GETRCV(moo,nargs));
+	MOO_STACK_SETRETTORCV (moo, nargs);
+	return MOO_PF_SUCCESS;
+}
+
 static moo_pfrc_t pf_hash (moo_t* moo, moo_ooi_t nargs)
 {
 	moo_oop_t rcv;
@@ -2979,6 +3071,34 @@ static moo_pfrc_t pf_system_log (moo_t* moo, moo_ooi_t nargs)
 	return MOO_PF_SUCCESS;
 }
 
+static moo_pfrc_t pf_system_pop_collectable (moo_t* moo, moo_ooi_t nargs)
+{
+	if (moo->collectable.first)
+	{
+		moo_collectable_t* first;
+
+		first = moo->collectable.first;
+
+		/* TODO: if it's already fininalized, delete it from collectable */
+		MOO_ASSERT (moo, MOO_OOP_IS_POINTER(first->oop));
+		MOO_ASSERT (moo, MOO_OBJ_GET_FLAGS_GCFIN(first->oop) & MOO_GCFIN_FINALIZABLE);
+
+		MOO_STACK_SETRET (moo, nargs, first->oop);
+		MOO_OBJ_SET_FLAGS_GCFIN (first->oop, MOO_OBJ_GET_FLAGS_GCFIN(first->oop) | MOO_GCFIN_FINALIZED);
+
+MOO_DEBUG1 (moo, "POPPING FINALIZABLE...%O\n", first->oop);
+		MOO_DELETE_FROM_LIST (&moo->collectable, first);
+		moo_freemem (moo, first);
+
+MOO_DEBUG1 (moo, "POPPED FINALIZABLE...%p\n", moo->collectable.first);
+	}
+	else
+	{
+		MOO_STACK_SETRETTOERROR (moo, nargs, MOO_ENOENT);
+	}
+	return MOO_PF_SUCCESS;
+}
+
 static MOO_INLINE moo_pfrc_t _system_alloc (moo_t* moo, moo_ooi_t nargs, int clear)
 {
 	moo_oop_t tmp;
@@ -3208,7 +3328,6 @@ static MOO_INLINE int _store_raw_uint (moo_t* moo, moo_uint8_t* rawptr, moo_oow_
 {
 	int n;
 	moo_oow_t w, max;
-	
 
 	if ((n = moo_inttooow (moo, voop, &w)) <= 0) 
 	{
@@ -3793,6 +3912,7 @@ static pf_t pftab[] =
 	{ "_integer_ge",                           { pf_integer_ge,                           1, 1 } },
 	{ "_integer_inttostr",                     { pf_integer_inttostr,                     1, 1 } },
 
+	{ "Apex_addToBeFinalized",                 { pf_add_to_be_finalized,                  0, 0 } },
 	{ "Apex__basicNew",                        { pf_basic_new,                            0, 0 } },
 	{ "Apex__basicNew:",                       { pf_basic_new,                            1, 1 } },
 	{ "Apex__basicSize",                       { pf_basic_size,                           0, 0 } },
@@ -3800,6 +3920,7 @@ static pf_t pftab[] =
 	{ "Apex_basicNew:",                        { pf_basic_new,                            1, 1 } },
 	{ "Apex_basicSize",                        { pf_basic_size,                           0, 0 } },
 	{ "Apex_class",                            { pf_class,                                0, 0 } },
+	{ "Apex_removeToBeFinalized",              { pf_remove_to_be_finalized,               0, 0 } },
 
 	{ "Character_asInteger",                   { pf_character_as_smooi,                   0, 0 } },
 
@@ -3851,6 +3972,7 @@ static pf_t pftab[] =
 	{ "System__getUint64",                     { pf_system_get_uint64,                    2, 2 } },
 	{ "System__getUint8",                      { pf_system_get_uint8,                     2, 2 } },
 	{ "System__malloc",                        { pf_system_malloc,                        1, 1 } },
+	{ "System__popCollectable",                { pf_system_pop_collectable,               0, 0 } },
 	{ "System__putInt8",                       { pf_system_put_int8,                      3, 3 } },
 	{ "System__putInt16",                      { pf_system_put_int16,                     3, 3 } },
 	{ "System__putInt32",                      { pf_system_put_int32,                     3, 3 } },
@@ -3893,7 +4015,8 @@ static int start_method (moo_t* moo, moo_oop_method_t method, moo_oow_t nargs)
 	moo_ooi_t /*sp,*/ stack_base;
 
 #if defined(MOO_DEBUG_VM_EXEC)
-	moo_ooi_t fetched_instruction_pointer = 0; /* set it to a fake value */
+	/* set it to a fake value */
+	moo->last_instruction_pointer = 0; 
 #endif
 
 	preamble = MOO_OOP_TO_SMOOI(method->preamble);
@@ -4441,7 +4564,8 @@ finalization:
 	return 1;
 }
 
-int moo_execute (moo_t* moo)
+
+static int __execute (moo_t* moo)
 {
 	moo_oob_t bcode;
 	moo_oow_t b1, b2;
@@ -4449,15 +4573,6 @@ int moo_execute (moo_t* moo)
 	int unwind_protect;
 	moo_oop_context_t unwind_start;
 	moo_oop_context_t unwind_stop;
-	int vm_startup_called = 0;
-
-#if defined(MOO_PROFILE_VM)
-	moo_uintmax_t inst_counter = 0;
-#endif
-
-#if defined(MOO_DEBUG_VM_EXEC)
-	moo_ooi_t fetched_instruction_pointer;
-#endif
 
 	MOO_ASSERT (moo, moo->active_context != MOO_NULL);
 
@@ -4468,24 +4583,22 @@ int moo_execute (moo_t* moo)
  * these can be dirty if this function is called again esepcially after failure.
  */
 
-	if (vm_startup(moo) <= -1) goto oops;
-	vm_startup_called = 1;
-
-	moo->proc_switched = 0;
-	moo->abort_req = 0;
-
 	while (!moo->abort_req)
 	{
+		/*
+		if (moo->gc_finalization_pending)
+			switch_to_gc_process (xxxx);
+		else */
 		if (switch_process_if_needed(moo) == 0) break; /* no more runnable process */
 
 #if defined(MOO_DEBUG_VM_EXEC)
-		fetched_instruction_pointer = moo->ip;
+		moo->last_inst_pointer = moo->ip;
 #endif
 		FETCH_BYTE_CODE_TO (moo, bcode);
 		/*while (bcode == BCODE_NOOP) FETCH_BYTE_CODE_TO (moo, bcode);*/
 
 #if defined(MOO_PROFILE_VM)
-		inst_counter++;
+		moo->inst_counter++;
 #endif
 
 		switch (bcode)
@@ -5006,7 +5119,7 @@ int moo_execute (moo_t* moo)
 				selector = (moo_oop_char_t)moo->active_method->slot[b2];
 
 				LOG_INST_3 (moo, "send_message%hs %zu @%zu", (((bcode >> 2) & 1)? "_to_super": ""), b1, b2);
-				if (send_message (moo, selector, ((bcode >> 2) & 1), b1) <= -1) goto oops;
+				if (send_message (moo, selector, ((bcode >> 2) & 1), b1) <= -1) return -1;
 				break;
 			}
 
@@ -5110,7 +5223,7 @@ int moo_execute (moo_t* moo)
 				 */
 				MOO_STACK_PUSH (moo, (moo_oop_t)moo->_dictionary);
 				MOO_STACK_PUSH (moo, MOO_SMOOI_TO_OOP(b1));
-				if (send_message (moo, moo->dicnewsym, 0, 1) <= -1) goto oops;
+				if (send_message (moo, moo->dicnewsym, 0, 1) <= -1) return -1;
 				break;
 
 			case BCODE_POP_INTO_DICTIONARY:
@@ -5124,7 +5237,7 @@ int moo_execute (moo_t* moo)
 				t2 = MOO_STACK_GETTOP(moo);
 				moo_putatdic (moo, (moo_oop_dic_t)t2, ((moo_oop_association_t)t1)->key, ((moo_oop_association_t)t1)->value);
 				 */
-				if (send_message (moo, moo->dicputassocsym, 0, 1) <= -1) goto oops; 
+				if (send_message (moo, moo->dicputassocsym, 0, 1) <= -1) return -1;
 				break;
 
 			case BCODE_MAKE_ARRAY:
@@ -5136,7 +5249,7 @@ int moo_execute (moo_t* moo)
 
 				/* create an empty array */
 				t = moo_instantiate (moo, moo->_array, MOO_NULL, b1);
-				if (!t) goto oops;
+				if (!t) return -1;
 
 				MOO_STACK_PUSH (moo, t); /* push the array created */
 				break;
@@ -5312,7 +5425,7 @@ int moo_execute (moo_t* moo)
 
 						MOO_LOG0 (moo, MOO_LOG_IC | MOO_LOG_ERROR, "Error - cannot return from dead context\n");
 						moo_seterrnum (moo, MOO_EINTERN); /* TODO: can i make this error catchable at the moo level? */
-						goto oops;
+						return -1;
 
 					non_local_return_ok:
 /*MOO_DEBUG2 (moo, "NON_LOCAL RETURN OK TO... %p %p\n", moo->active_context->origin, moo->active_context->origin->sender);*/
@@ -5349,7 +5462,7 @@ int moo_execute (moo_t* moo)
 						MOO_STACK_PUSH (moo, (moo_oop_t)unwind_stop);
 						MOO_STACK_PUSH (moo, (moo_oop_t)return_value);
 
-						if (send_message_with_str (moo, fbm, 16, 0, 2) <= -1) goto oops;
+						if (send_message_with_str (moo, fbm, 16, 0, 2) <= -1) return -1;
 					}
 					else
 					{
@@ -5376,9 +5489,14 @@ int moo_execute (moo_t* moo)
 							MOO_ASSERT (moo, moo->sp == 0); 
 
 							if (moo->option.trait & MOO_AWAIT_PROCS)
+							{
 								terminate_process (moo, moo->processor->active);
+							}
 							else
+							{
+								/* graceful termination of the whole vm */
 								goto done;
+							}
 
 							/* TODO: store the return value to the VM register.
 							 * the caller to moo_execute() can fetch it to return it to the system */
@@ -5442,7 +5560,7 @@ int moo_execute (moo_t* moo)
 				 * this base block context is created with no stack for 
 				 * this reason */
 				blkctx = (moo_oop_context_t)moo_instantiate (moo, moo->_block_context, MOO_NULL, 0); 
-				if (!blkctx) goto oops;
+				if (!blkctx) return -1;
 
 				/* the long forward jump instruction has the format of 
 				 *   11000100 KKKKKKKK or 11000100 KKKKKKKK KKKKKKKK 
@@ -5499,7 +5617,7 @@ int moo_execute (moo_t* moo)
 				 * this base block context is created with no 
 				 * stack for this reason. */
 				blkctx = (moo_oop_context_t)moo_instantiate (moo, moo->_block_context, MOO_NULL, 0); 
-				if (!blkctx) goto oops;
+				if (!blkctx) return -1;
 
 				/* get the receiver to the block copy message after block context instantiation
 				 * not to get affected by potential GC */
@@ -5566,20 +5684,37 @@ int moo_execute (moo_t* moo)
 			default:
 				MOO_LOG1 (moo, MOO_LOG_IC | MOO_LOG_FATAL, "Fatal error - unknown byte code 0x%zx\n", bcode);
 				moo_seterrnum (moo, MOO_EINTERN);
-				goto oops;
+				return -1;
 		}
 	}
 
 done:
-	vm_cleanup (moo);
-#if defined(MOO_PROFILE_VM)
-	MOO_LOG1 (moo, MOO_LOG_IC | MOO_LOG_INFO, "TOTAL_INST_COUTNER = %zu\n", inst_counter);
-#endif
 	return 0;
+}
 
-oops:
-	if (vm_startup_called) vm_cleanup (moo);
-	return -1;
+
+int moo_execute (moo_t* moo)
+{
+	int n;
+
+#if defined(MOO_PROFILE_VM)
+	moo->inst_counter = 0;
+#endif
+
+	if (vm_startup(moo) <= -1) return -1;
+
+	moo->proc_switched = 0;
+	moo->abort_req = 0;
+
+	n = __execute (moo);
+
+	vm_cleanup (moo);
+
+#if defined(MOO_PROFILE_VM)
+	MOO_LOG1 (moo, MOO_LOG_IC | MOO_LOG_INFO, "TOTAL_INST_COUTNER = %zu\n", moo->inst_counter);
+#endif
+
+	return n;
 }
 
 void moo_abort (moo_t* moo)
diff --git a/moo/lib/gc.c b/moo/lib/gc.c
index b84ded1..456f84e 100644
--- a/moo/lib/gc.c
+++ b/moo/lib/gc.c
@@ -117,6 +117,9 @@ static kernel_class_info_t kernel_classes[] =
 	{  6, { 'S','y','s','t','e','m'                                                         }, MOO_OFFSETOF(moo_t, _system) },
 };
 
+
+static void move_finalizable_objects (moo_t* moo);
+
 /* ----------------------------------------------------------------------- 
  * BOOTSTRAPPER
  * ----------------------------------------------------------------------- */
@@ -701,6 +704,11 @@ void moo_gc (moo_t* moo)
 	ptr = (moo_uint8_t*) MOO_ALIGN ((moo_uintptr_t)moo->newheap->base, MOO_SIZEOF(moo_oop_t));
 	ptr = scan_new_heap (moo, ptr);
 
+/* FINALIZATION */
+	move_finalizable_objects (moo);
+	ptr = scan_new_heap (moo, ptr);
+/* END FINALIZATION */
+
 	/* traverse the symbol table for unreferenced symbols.
 	 * if the symbol has not moved to the new heap, the symbol
 	 * is not referenced by any other objects than the symbol 
@@ -809,3 +817,97 @@ moo_oop_t moo_shallowcopy (moo_t* moo, moo_oop_t oop)
 
 	return oop;
 }
+
+
+
+int moo_regfinalizable (moo_t* moo, moo_oop_t oop)
+{
+	moo_collectable_t* x;
+
+MOO_DEBUG1 (moo, "ADDING FINALIZABLE... %O\n", oop);
+	if (!MOO_OOP_IS_POINTER(oop) || 
+         (MOO_OBJ_GET_FLAGS_GCFIN(oop) & (MOO_GCFIN_FINALIZABLE | MOO_GCFIN_FINALIZED)))
+	{
+		moo_seterrnum (moo, MOO_EINVAL);
+		return -1;
+	}
+
+	x = moo_allocmem (moo, MOO_SIZEOF(*x));
+	if (!x) return -1;
+
+	MOO_OBJ_SET_FLAGS_GCFIN (oop, MOO_GCFIN_FINALIZABLE);
+	x->oop = oop;
+
+	MOO_APPEND_TO_LIST (&moo->finalizable, x);
+
+MOO_DEBUG1 (moo, "ADDED FINALIZABLE... %O\n", oop);
+	return 0;
+}
+
+
+int moo_deregfinalizable (moo_t* moo, moo_oop_t oop)
+{
+	moo_collectable_t* x;
+
+	if (!MOO_OOP_IS_POINTER(oop) || 
+	    ((MOO_OBJ_GET_FLAGS_GCFIN(oop) & (MOO_GCFIN_FINALIZABLE | MOO_GCFIN_FINALIZED)) != MOO_GCFIN_FINALIZABLE))
+	{
+		moo_seterrnum (moo, MOO_EINVAL);
+		return -1;
+	}
+
+	x = moo->finalizable.first;
+	while (x)
+	{
+		if (x->oop == oop)
+		{
+/* TODO: do i need to clear other flags like GC */
+			MOO_OBJ_SET_FLAGS_GCFIN(oop, (MOO_OBJ_GET_FLAGS_GCFIN(oop) & ~MOO_GCFIN_FINALIZABLE));
+			MOO_DELETE_FROM_LIST (&moo->finalizable, x);
+			return  0;
+		}
+	}
+
+	moo_seterrnum (moo, MOO_ENOENT);
+	return -1;
+}
+
+static void move_finalizable_objects (moo_t* moo)
+{
+	moo_collectable_t* x, * y;
+
+	for (x = moo->collectable.first; x; x = x->next)
+	{
+		x->oop = moo_moveoop (moo, x->oop);
+	}
+
+	for (x = moo->finalizable.first; x; )
+	{
+		y = x->next;
+
+		if (!MOO_OBJ_GET_FLAGS_MOVED(x->oop))
+		{
+/* TODO: if already finalized, don't move, don't add to collectable 
+if (MOVE_OBJ_GET_FLAGS_FINALIZED(x->oop)) continue; 
+* */
+			x->oop = moo_moveoop (moo, x->oop);
+
+			/* it's almost collectable. but don't collect it yet.
+			 * if garbages consist of finalizable objects only, GC should fail miserably */
+
+			/* remove it from the finalizable list */
+			MOO_DELETE_FROM_LIST (&moo->finalizable, x);
+
+			/* add it to the collectable list */
+			MOO_APPEND_TO_LIST (&moo->collectable, x);
+
+			//signal_semaphore (moo, moo->collectable_semaphore);
+		}
+		else
+		{
+			x->oop = moo_moveoop (moo, x->oop);
+		}
+
+		x = y;
+	}
+}
diff --git a/moo/lib/moo-prv.h b/moo/lib/moo-prv.h
index aee85eb..27f1dbf 100644
--- a/moo/lib/moo-prv.h
+++ b/moo/lib/moo-prv.h
@@ -1106,6 +1106,13 @@ moo_oop_nsdic_t moo_makensdic (
 	moo_oow_t       size
 );
 
+
+/* ========================================================================= */
+/* gc.c                                                                      */
+/* ========================================================================= */
+int moo_regfinalizable (moo_t* moo, moo_oop_t oop);
+int moo_deregfinalizable (moo_t* moo, moo_oop_t oop);
+
 /* ========================================================================= */
 /* proc.c                                                                    */
 /* ========================================================================= */
diff --git a/moo/lib/moo-utl.h b/moo/lib/moo-utl.h
index f97f63f..b4082b9 100644
--- a/moo/lib/moo-utl.h
+++ b/moo/lib/moo-utl.h
@@ -29,6 +29,34 @@
 
 #include "moo-cmn.h"
 
+
+/* ----------------------------------------------------------------------- 
+ * DOUBLY LINKED LIST MACROS
+ * ----------------------------------------------------------------------- */
+#define MOO_APPEND_TO_LIST(list, node) do { \
+	(node)->next = MOO_NULL; \
+	(node)->prev = (list)->last; \
+	if ((list)->first) (list)->last->next = (node); \
+	else (list)->first = (node); \
+	(list)->last = (node); \
+} while(0)
+
+#define MOO_PREPPEND_TO_LIST(list, node) do { \
+	(node)->prev = MOO_NULL; \
+	(node)->next = (list)->first; \
+	if ((list)->last) (list)->first->prev = (node); \
+	else (list)->last = (node); \
+	(list)->first = (node); \
+} while(0)
+
+#define MOO_DELETE_FROM_LIST(list, node) do { \
+	if ((node)->prev) (node)->prev->next = (node)->next; \
+	else (list)->first = (node)->next; \
+	if ((node)->next) (node)->next->prev = (node)->prev; \
+	else (list)->last = (node)->prev; \
+} while(0)
+
+
 #if defined(__cplusplus)
 extern "C" {
 #endif
diff --git a/moo/lib/moo.h b/moo/lib/moo.h
index 721334f..3e22491 100644
--- a/moo/lib/moo.h
+++ b/moo/lib/moo.h
@@ -311,6 +311,13 @@ enum moo_obj_type_t
 };
 typedef enum moo_obj_type_t moo_obj_type_t;
 
+enum moo_gcfin_t
+{
+	MOO_GCFIN_FINALIZABLE = (1 << 0),
+	MOO_GCFIN_FINALIZED   = (1 << 1)
+};
+typedef enum moo_gcfin_t moo_gcfin_t;
+
 /* =========================================================================
  * Object header structure 
  * 
@@ -330,6 +337,7 @@ typedef enum moo_obj_type_t moo_obj_type_t;
  *   moved: 0 or 1. used by GC. internal use only.
  *   ngc: 0 or 1, used by GC. internal use only.
  *   rdonly: 0 or 1. indicates that an object is immutable.
+ *   gcfin: represents finalzation state.
  *   trailer: 0 or 1. indicates that there are trailing bytes
  *            after the object payload. internal use only.
  *
@@ -358,14 +366,15 @@ typedef enum moo_obj_type_t moo_obj_type_t;
  * size calculation and the access to the payload fields become more complex. 
  * Therefore, i've dropped the idea.
  * ========================================================================= */
-#define MOO_OBJ_FLAGS_TYPE_BITS    6
-#define MOO_OBJ_FLAGS_UNIT_BITS    5
-#define MOO_OBJ_FLAGS_EXTRA_BITS   1
-#define MOO_OBJ_FLAGS_KERNEL_BITS  2
-#define MOO_OBJ_FLAGS_MOVED_BITS   1
-#define MOO_OBJ_FLAGS_NGC_BITS     1
-#define MOO_OBJ_FLAGS_RDONLY_BITS  1
-#define MOO_OBJ_FLAGS_TRAILER_BITS 1
+#define MOO_OBJ_FLAGS_TYPE_BITS     6
+#define MOO_OBJ_FLAGS_UNIT_BITS     5
+#define MOO_OBJ_FLAGS_EXTRA_BITS    1
+#define MOO_OBJ_FLAGS_KERNEL_BITS   2
+#define MOO_OBJ_FLAGS_MOVED_BITS    1
+#define MOO_OBJ_FLAGS_NGC_BITS      1
+#define MOO_OBJ_FLAGS_RDONLY_BITS   1
+#define MOO_OBJ_FLAGS_GCFIN_BITS    2
+#define MOO_OBJ_FLAGS_TRAILER_BITS  1
 
 #define MOO_OBJ_FLAGS_TYPE_SHIFT    (MOO_OBJ_FLAGS_UNIT_BITS    + MOO_OBJ_FLAGS_UNIT_SHIFT)
 #define MOO_OBJ_FLAGS_UNIT_SHIFT    (MOO_OBJ_FLAGS_EXTRA_BITS   + MOO_OBJ_FLAGS_EXTRA_SHIFT)
@@ -373,7 +382,8 @@ typedef enum moo_obj_type_t moo_obj_type_t;
 #define MOO_OBJ_FLAGS_KERNEL_SHIFT  (MOO_OBJ_FLAGS_MOVED_BITS   + MOO_OBJ_FLAGS_MOVED_SHIFT)
 #define MOO_OBJ_FLAGS_MOVED_SHIFT   (MOO_OBJ_FLAGS_NGC_BITS     + MOO_OBJ_FLAGS_NGC_SHIFT)
 #define MOO_OBJ_FLAGS_NGC_SHIFT     (MOO_OBJ_FLAGS_RDONLY_BITS  + MOO_OBJ_FLAGS_RDONLY_SHIFT)
-#define MOO_OBJ_FLAGS_RDONLY_SHIFT  (MOO_OBJ_FLAGS_TRAILER_BITS + MOO_OBJ_FLAGS_TRAILER_SHIFT)
+#define MOO_OBJ_FLAGS_RDONLY_SHIFT  (MOO_OBJ_FLAGS_GCFIN_BITS   + MOO_OBJ_FLAGS_GCFIN_SHIFT)
+#define MOO_OBJ_FLAGS_GCFIN_SHIFT   (MOO_OBJ_FLAGS_TRAILER_BITS + MOO_OBJ_FLAGS_TRAILER_SHIFT)
 #define MOO_OBJ_FLAGS_TRAILER_SHIFT (0)
 
 #define MOO_OBJ_GET_FLAGS_TYPE(oop)       MOO_GETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_TYPE_SHIFT,    MOO_OBJ_FLAGS_TYPE_BITS)
@@ -383,6 +393,7 @@ typedef enum moo_obj_type_t moo_obj_type_t;
 #define MOO_OBJ_GET_FLAGS_MOVED(oop)      MOO_GETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_MOVED_SHIFT,   MOO_OBJ_FLAGS_MOVED_BITS)
 #define MOO_OBJ_GET_FLAGS_NGC(oop)        MOO_GETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_NGC_SHIFT,     MOO_OBJ_FLAGS_NGC_BITS)
 #define MOO_OBJ_GET_FLAGS_RDONLY(oop)     MOO_GETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_RDONLY_SHIFT,  MOO_OBJ_FLAGS_RDONLY_BITS)
+#define MOO_OBJ_GET_FLAGS_GCFIN(oop)      MOO_GETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_GCFIN_SHIFT,   MOO_OBJ_FLAGS_GCFIN_BITS)
 #define MOO_OBJ_GET_FLAGS_TRAILER(oop)    MOO_GETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_TRAILER_SHIFT, MOO_OBJ_FLAGS_TRAILER_BITS)
 
 #define MOO_OBJ_SET_FLAGS_TYPE(oop,v)     MOO_SETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_TYPE_SHIFT,    MOO_OBJ_FLAGS_TYPE_BITS,     v)
@@ -392,6 +403,7 @@ typedef enum moo_obj_type_t moo_obj_type_t;
 #define MOO_OBJ_SET_FLAGS_MOVED(oop,v)    MOO_SETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_MOVED_SHIFT,   MOO_OBJ_FLAGS_MOVED_BITS,    v)
 #define MOO_OBJ_SET_FLAGS_NGC(oop,v)      MOO_SETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_NGC_SHIFT,     MOO_OBJ_FLAGS_NGC_BITS,      v)
 #define MOO_OBJ_SET_FLAGS_RDONLY(oop,v)   MOO_SETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_RDONLY_SHIFT,  MOO_OBJ_FLAGS_RDONLY_BITS,   v)
+#define MOO_OBJ_SET_FLAGS_GCFIN(oop,v)    MOO_SETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_GCFIN_SHIFT,   MOO_OBJ_FLAGS_GCFIN_BITS,    v)
 #define MOO_OBJ_SET_FLAGS_TRAILER(oop,v)  MOO_SETBITS(moo_oow_t, (oop)->_flags, MOO_OBJ_FLAGS_TRAILER_SHIFT, MOO_OBJ_FLAGS_TRAILER_BITS,  v)
 
 #define MOO_OBJ_GET_SIZE(oop) ((oop)->_size)
@@ -989,6 +1001,14 @@ struct moo_sbuf_t
 };
 typedef struct moo_sbuf_t moo_sbuf_t;
 
+typedef struct moo_collectable_t moo_collectable_t;
+struct moo_collectable_t
+{
+	moo_oop_t oop;
+	moo_collectable_t* prev;
+	moo_collectable_t* next;
+};
+
 /* special callback to be called for trailer */
 typedef void (*moo_trgc_t) (moo_t* moo, moo_oop_t obj);
 
@@ -1156,6 +1176,21 @@ struct moo_t
 
 	moo_sbuf_t sbuf[64];
 
+	struct
+	{
+		moo_collectable_t* first;
+		moo_collectable_t* last;
+	} collectable;
+
+	struct
+	{
+		moo_collectable_t* first;
+		moo_collectable_t* last;
+	} finalizable;
+
+	moo_uintmax_t inst_counter;
+	moo_ooi_t last_inst_pointer;
+
 #if defined(MOO_INCLUDE_COMPILER)
 	moo_compiler_t* c;
 #endif
diff --git a/moo/mod/x11.c b/moo/mod/x11.c
index 1cc83b7..acca5d0 100644
--- a/moo/mod/x11.c
+++ b/moo/mod/x11.c
@@ -163,6 +163,7 @@ oops:
 static moo_pfrc_t pf_close_display (moo_t* moo, moo_ooi_t nargs)
 {
 	oop_x11_t x11;
+	x11_trailer_t* tr;
 
 // TODO: CHECK if the receiver is an X11 object
 
@@ -174,6 +175,14 @@ static moo_pfrc_t pf_close_display (moo_t* moo, moo_ooi_t nargs)
 		x11->display = moo->_nil;
 	}
 
+
+	tr = moo_getobjtrailer (moo, MOO_STACK_GETRCV(moo,nargs), MOO_NULL);
+	if (tr->event)
+	{
+		moo_freemem (moo, tr->event);
+		tr->event = MOO_NULL;
+	}
+
 	MOO_STACK_SETRETTORCV (moo, nargs);
 	return MOO_PF_SUCCESS;
 }