diff --git a/libmulti/libmulti.cpp b/libmulti/libmulti.cpp
index 562d604..80ce934 100644
--- a/libmulti/libmulti.cpp
+++ b/libmulti/libmulti.cpp
@@ -9,10 +9,10 @@ static ATOM nikWindowClass{ 0 };
 std::vector<std::pair<HWND, CMultiD2D*>> vecWindows{ };
 DWORD LastError{ ERROR_SUCCESS };
 static char* LastString{ nullptr };
-static CRITICAL_SECTION Mutex{ 0 };
+static CRITICAL_SECTION* Mutex{ nullptr };
 
-void EnterVector(void) { EnterCriticalSection(&Mutex); }
-void LeaveVector(void) { LeaveCriticalSection(&Mutex); }
+void EnterVector(void) { EnterCriticalSection(Mutex); }
+void LeaveVector(void) { LeaveCriticalSection(Mutex); }
 
 bool _libmulti_exists(double index) {
 	bool ret = true;
@@ -382,7 +382,8 @@ LIBMULTI_VOID RegisterCallbacks(char* p1, char* p2, char* p3, char* p4) {
 LIBMULTI_DOUBLE libmulti_init(void) {
 	printf(__FUNCTION__ ": hello!\n");
 	fflush(stdout);
-	InitializeCriticalSection(&Mutex);
+	Mutex = new CRITICAL_SECTION();
+	InitializeCriticalSection(Mutex);
 	InitMultiD2D();
 	EnterVector();
 	nikWindowClass = register_window_class(WindowProc);
@@ -391,6 +392,20 @@ LIBMULTI_DOUBLE libmulti_init(void) {
 	return nikWindowClass;
 }
 
+LIBMULTI_DOUBLE libmulti_quit(void) {
+	if (Mutex == nullptr) return -1.0;
+	EnterVector();
+	for (const auto& pair : vecWindows) {
+		DestroyWindow(pair.first);
+	}
+	BOOL ok = unregister_window_class(nikWindowClass, hModule);
+	LastError = GetLastError();
+	LeaveVector();
+	DeleteCriticalSection(Mutex);
+	Mutex = nullptr;
+	return ok;
+}
+
 LIBMULTI_STRING libmulti_last_error_message(void) {
 	EnterVector();
 	DWORD myError = LastError;
diff --git a/libmulti/libmulti.h b/libmulti/libmulti.h
index d46bcdd..2895fb7 100644
--- a/libmulti/libmulti.h
+++ b/libmulti/libmulti.h
@@ -29,10 +29,12 @@ extern std::vector<std::pair<HWND, CMultiD2D*>> vecWindows;
 bool _libmulti_exists(double index);
 DWORD WINAPI libmulti_window_thread(LPVOID lpThreadParameter);
 ATOM register_window_class(WNDPROC p);
+BOOL unregister_window_class(ATOM c, HINSTANCE hi);
 
 
 LIBMULTI_VOID   RegisterCallbacks(char* p1, char* p2, char* p3, char* p4);
 LIBMULTI_DOUBLE libmulti_init(void);
+LIBMULTI_DOUBLE libmulti_quit(void);
 LIBMULTI_DOUBLE libmulti_present(void);
 LIBMULTI_DOUBLE libmulti_exists(double index);
 LIBMULTI_DOUBLE libmulti_last_error_code(void);
diff --git a/libmulti/libmulti.rc b/libmulti/libmulti.rc
new file mode 100644
index 0000000..0d571ad
Binary files /dev/null and b/libmulti/libmulti.rc differ
diff --git a/libmulti/libmulti.vcxproj b/libmulti/libmulti.vcxproj
index 6318cb5..4567944 100644
--- a/libmulti/libmulti.vcxproj
+++ b/libmulti/libmulti.vcxproj
@@ -153,6 +153,7 @@
   <ItemGroup>
     <ClInclude Include="libmulti.h" />
     <ClInclude Include="MultiD2D.h" />
+    <ClInclude Include="resource.h" />
     <ClInclude Include="stdafx.h" />
     <ClInclude Include="targetver.h" />
   </ItemGroup>
@@ -172,6 +173,9 @@
       <PrecompiledHeader Condition="'$(Configuration)|$(Platform)'=='Release|x64'">Create</PrecompiledHeader>
     </ClCompile>
   </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="libmulti.rc" />
+  </ItemGroup>
   <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
   <ImportGroup Label="ExtensionTargets">
   </ImportGroup>
diff --git a/libmulti/libmulti.vcxproj.filters b/libmulti/libmulti.vcxproj.filters
index f33ce07..1f85fba 100644
--- a/libmulti/libmulti.vcxproj.filters
+++ b/libmulti/libmulti.vcxproj.filters
@@ -30,6 +30,9 @@
     <ClInclude Include="MultiD2D.h">
       <Filter>Заголовочные файлы</Filter>
     </ClInclude>
+    <ClInclude Include="resource.h">
+      <Filter>Заголовочные файлы</Filter>
+    </ClInclude>
   </ItemGroup>
   <ItemGroup>
     <ClCompile Include="stdafx.cpp">
@@ -60,4 +63,9 @@
       <Filter>Файлы исходного кода</Filter>
     </ClCompile>
   </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="libmulti.rc">
+      <Filter>Файлы ресурсов</Filter>
+    </ResourceCompile>
+  </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/libmulti/libmulti_wndclass.cpp b/libmulti/libmulti_wndclass.cpp
index cc310c7..1e6237b 100644
--- a/libmulti/libmulti_wndclass.cpp
+++ b/libmulti/libmulti_wndclass.cpp
@@ -3,6 +3,10 @@
 #include "stdafx.h"
 #include "libmulti.h"
 
+BOOL unregister_window_class(ATOM c, HINSTANCE hi) {
+	return UnregisterClass(reinterpret_cast<LPCTSTR>(c), hi);
+}
+
 ATOM register_window_class(WNDPROC p) {
 	WNDCLASSEX wnd;
 	wnd.cbSize = sizeof(wnd);
diff --git a/libmulti/resource.h b/libmulti/resource.h
new file mode 100644
index 0000000..d49be1b
--- /dev/null
+++ b/libmulti/resource.h
@@ -0,0 +1,14 @@
+//{{NO_DEPENDENCIES}}
+// Microsoft Visual C++ generated include file.
+// Used by libmulti.rc
+
+// ��������� ����������� �������� ��� ����� ��������
+// 
+#ifdef APSTUDIO_INVOKED
+#ifndef APSTUDIO_READONLY_SYMBOLS
+#define _APS_NEXT_RESOURCE_VALUE        101
+#define _APS_NEXT_COMMAND_VALUE         40001
+#define _APS_NEXT_CONTROL_VALUE         1001
+#define _APS_NEXT_SYMED_VALUE           101
+#endif
+#endif