bool isFullScreenModeActive;

virtual bool Key(dword key, int count) {
	static dword style;
	static Rect normalwindowrect;
		
	switch (key) {
		case K_F11:
			if (!isFullScreenModeActive) {
				// Get the current Top window's style bits
				style = GetStyle();
				// Strips the caption bit, which is the title bar
				style = (style & ~WS_CAPTION);
				// Save the "overlapped" or normal window shape
				normalwindowrect = GetRect(); 
				SetWindowLong(GetHWND(), GWL_STYLE, style);  
					
				// Get the full size of the screen
				long cx = GetSystemMetrics(SM_CXSCREEN);
	   			long cy = GetSystemMetrics(SM_CYSCREEN);
	   			// Expand the window to full size
		   		SetWindowPos(GetHWND(),HWND_TOP,0,0,cx,cy,SWP_SHOWWINDOW); 
				//or use Maximize(false) if you like a 
				//delayed resizing, even with zoom effects turned off
			} else {
				// Set the caption bit back so we can get our title bar back
				style |= WS_CAPTION;
				// Pass to windows (Style() method gets confused on SyncCaption0)
				SetWindowLong(GetHWND(), GWL_STYLE, style);
				// Return size to normal; key flag is SWP_FRAMECHANGED
				SetWindowPos(GetHWND(),HWND_TOP, 
					normalwindowrect.left, 
					normalwindowrect.top, 
					normalwindowrect.Width(), 
					normalwindowrect.Height(), SWP_SHOWWINDOW|SWP_FRAMECHANGED);
				}
				// Track logically in our application
				isFullScreenModeActive = !isFullScreenModeActive;
				break;
	}
	return false;
}