#include <aygshell.h>
LRESULT CALLBACK SHFullScreenWndProc(HWND hwnd, UINT message,
WPARAM wParam, LPARAM lParam)
{
	static fFullScreen = FALSE;
	switch (message)
	{
		case WM_KEYDOWN:
		{
			// Toggle between full screen and normal mode when the
user presses the space bar.
			if (VK_SPACE == wParam)
			{
				DWORD dwState;
				RECT rc;
				if (fFullScreen)
				{
					// To switch to normal mode, first show all of
the shell parts.
					dwState = (SHFS_SHOWTASKBAR |
SHFS_SHOWSTARTICON | SHFS_SHOWSIPBUTTON);
					SHFullScreen(hwnd, dwState);
					// Next resize the main window to the size of
the work area.
					SystemParametersInfo(SPI_GETWORKAREA, 0,
&rc, FALSE);
					MoveWindow(hwnd, rc.left, rc.top,
rc.right-rc.left, rc.bottom-rc.top, TRUE);
					fFullScreen = !fFullScreen;
			}
				else
				{
					// To switch to full screen mode, first hide
all of the shell parts.
					dwState = (SHFS_HIDETASKBAR |
SHFS_HIDESTARTICON | SHFS_HIDESIPBUTTON);
					SHFullScreen(hwnd, dwState);
					// Next resize the main window to the size of
the screen.
					SetRect(&rc, 0, 0,
GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));
					MoveWindow(hwnd, rc.left, rc.top,
rc.right-rc.left, rc.bottom-rc.top, TRUE);
					fFullScreen = !fFullScreen;
			}
		}
	}
		break;
}
	return DefWindowProc(hwnd, message, wParam, lParam);
}