// Class registered, so now create your window

    hwnd = CreateWindowEx(NULL,                // Extended style

                          "My Class",          // Class name

                          "A real Windows application", // App name

                          WS_OVERLAPPEDWINDOW |   // Window stle

                          WS_VISIBLE | WS_SYSMENU |
                          WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
                          100, 100,               // x,y coordinate

                          1024, 768,              // Width and height

                          NULL,                   // Handle to parent

                          NULL,                   // handle to menu

                          hInstance,
                          NULL);
  

  CreateWindowEx(WS_EX_APPWINDOW, "OpenGL", "Title", WS_POPUP | WS_CLIPSIBLINGS | WS_CLIPCHILDREN, 0, 0, 800, 600, NULL, NULL, hInstance, NULL);