diff --git a/sfall/FalloutEngine.cpp b/sfall/FalloutEngine.cpp
index e2b82502..7ef25235 100644
--- a/sfall/FalloutEngine.cpp
+++ b/sfall/FalloutEngine.cpp
@@ -361,6 +361,9 @@ const DWORD intface_update_hit_points_ = 0x45EBD8;
 const DWORD intface_update_items_ = 0x45EFEC;
 const DWORD intface_update_move_points_ = 0x45EE0C;
 const DWORD intface_use_item_ = 0x45F5EC;
+const DWORD intface_show_ = 0x45EA10;
+const DWORD intface_hide_ = 0x45E9E0;
+const DWORD intface_is_hidden_ = 0x45EA5C;
 const DWORD invenUnwieldFunc_ = 0x472A64;
 const DWORD invenWieldFunc_ = 0x472768;
 const DWORD inven_display_msg_ = 0x472D24;
@@ -735,9 +738,7 @@ int __stdcall ScrPtr(int scriptId, TScript** scriptPtr) {
 
 // redraws the main game interface windows (useful after changing some data like active hand, etc.)
 void InterfaceRedraw() {
-	__asm {
-		call intface_redraw_
-	}
+	__asm call intface_redraw_
 }
 
 // pops value type from Data stack (must be followed by InterpretPopLong)
@@ -823,4 +824,4 @@ TGameObj* __stdcall InvenLeftHand(TGameObj* critter) {
 TGameObj* __stdcall InvenRightHand(TGameObj* critter) {
 	__asm mov eax, critter
 	__asm call inven_right_hand_
-}
\ No newline at end of file
+}
diff --git a/sfall/FalloutEngine.h b/sfall/FalloutEngine.h
index 0d073ab9..9c585288 100644
--- a/sfall/FalloutEngine.h
+++ b/sfall/FalloutEngine.h
@@ -529,6 +529,9 @@ extern const DWORD intface_update_hit_points_;
 extern const DWORD intface_update_items_;
 extern const DWORD intface_update_move_points_;
 extern const DWORD intface_use_item_;
+extern const DWORD intface_show_;
+extern const DWORD intface_hide_;
+extern const DWORD intface_is_hidden_;
 extern const DWORD invenUnwieldFunc_; // (int critter@<eax>, int slot@<edx>, int a3@<ebx>) - int result (-1 on error, 0 on success)
 extern const DWORD invenWieldFunc_; // (int who@<eax>, int item@<edx>, int a3@<ecx>, int slot@<ebx>) - int result (-1 on error, 0 on success)
 extern const DWORD inven_display_msg_;
@@ -864,6 +867,15 @@ void SkillSetTags(int* tags, DWORD num);
 // redraws the main game interface windows (useful after changing some data like active hand, etc.)
 void InterfaceRedraw();
 
+// critter worn item (armor)
+TGameObj* __stdcall InvenWorn(TGameObj* critter);
+
+// item in critter's left hand slot
+TGameObj* __stdcall InvenLeftHand(TGameObj* critter);
+
+// item in critter's right hand slot
+TGameObj* __stdcall InvenRightHand(TGameObj* critter);
+
 // pops value type from Data stack (must be followed by InterpretPopLong)
 DWORD __stdcall InterpretPopShort(TProgram* scriptPtr);
 
@@ -889,12 +901,3 @@ void __declspec() DebugPrintf(const char* fmt, ...);
 
 // returns the name of current procedure by program pointer
 const char* __stdcall FindCurrentProc(TProgram* program);
-
-// critter worn item (armor)
-TGameObj* __stdcall InvenWorn(TGameObj* critter);
-
-// item in critter's left hand slot
-TGameObj* __stdcall InvenLeftHand(TGameObj* critter);
-
-// item in critter's right hand slot
-TGameObj* __stdcall InvenRightHand(TGameObj* critter);
\ No newline at end of file
diff --git a/sfall/ScriptExtender.cpp b/sfall/ScriptExtender.cpp
index b6b9ca70..5556349d 100644
--- a/sfall/ScriptExtender.cpp
+++ b/sfall/ScriptExtender.cpp
@@ -149,6 +149,9 @@ static void _stdcall PrintOpcodeError(const char* fmt, ...) {
 }
 
 // Handle opcodes
+// scriptPtr - pointer to script program (from the engine)
+// func - opcode handler
+// hasReturn - true if opcode has return value (is expression)
 static void __stdcall HandleOpcode(TProgram* scriptPtr, void(*func)(), int argNum, bool hasReturn) {
 	assert(argNum < OP_MAX_ARGUMENTS);
 
diff --git a/sfall/ScriptOps/InterfaceOp.hpp b/sfall/ScriptOps/InterfaceOp.hpp
index 37751eaf..62f4c6c2 100644
--- a/sfall/ScriptOps/InterfaceOp.hpp
+++ b/sfall/ScriptOps/InterfaceOp.hpp
@@ -440,3 +440,24 @@ end:
 		retn;
 	}
 }
+
+static void sf_intface_redraw() {
+	InterfaceRedraw();
+}
+
+static void sf_intface_show() {
+	__asm call intface_show_
+}
+
+static void sf_intface_hide() {
+	__asm call intface_hide_
+}
+
+static void sf_intface_is_hidden() {
+	int isHidden;
+	__asm {
+		call intface_is_hidden_
+		mov isHidden, eax;
+	}
+	SetOpReturn(isHidden);
+}
\ No newline at end of file
diff --git a/sfall/ScriptOps/MetaruleOp.hpp b/sfall/ScriptOps/MetaruleOp.hpp
index 32214df4..6f419d90 100644
--- a/sfall/ScriptOps/MetaruleOp.hpp
+++ b/sfall/ScriptOps/MetaruleOp.hpp
@@ -113,6 +113,11 @@ static const SfallMetarule metaruleArray[] = {
 	{"validate_test", sf_test, 2, 5, {DATATYPE_MASK_INT, DATATYPE_MASK_INT | DATATYPE_MASK_FLOAT, DATATYPE_MASK_STR, DATATYPE_NONE}},
 	{"spatial_radius", sf_spatial_radius, 1, 1, {DATATYPE_MASK_VALID_OBJ}},
 	{"critter_inven_obj2", sf_critter_inven_obj2, 2, 2, {DATATYPE_MASK_VALID_OBJ, DATATYPE_MASK_INT}},
+	{"intface_redraw", sf_intface_redraw, 0, 0, {}},
+	{"intface_show", sf_intface_show, 0, 0, {}},
+	{"intface_hide", sf_intface_hide, 0, 0, {}},
+	{"intface_is_hidden", sf_intface_is_hidden, 0, 0, {}},
+	{"exec_map_update_scripts", sf_exec_map_update_scripts, 0, 0, {}},
 };
 
 static void InitMetaruleTable() {
diff --git a/sfall/ScriptOps/MiscOps.hpp b/sfall/ScriptOps/MiscOps.hpp
index 3e45d422..dc2aa98f 100644
--- a/sfall/ScriptOps/MiscOps.hpp
+++ b/sfall/ScriptOps/MiscOps.hpp
@@ -1674,3 +1674,8 @@ end:
 	_RET_VAL_INT(ebp)
 	_OP_END
 }
+
+
+static void sf_exec_map_update_scripts() {
+	__asm call scr_exec_map_update_scripts_
+}
\ No newline at end of file