// Show the Startmenu:

keybd_event(VK_LWIN, MapVirtualKey(VK_LWIN, 0), 0, 0);
keybd_event(VK_LWIN, MapVirtualKey(VK_LWIN, 0), KEYEVENTF_KEYUP, 0)

//Show the Run-Dialog:

keybd_event(VK_LWIN, MapVirtualKey(VK_LWIN, 0), 0, 0);
keybd_event(Ord('R'), MapVirtualKey(Ord('R'), 0), 0, 0);
keybd_event(Ord('R'), MapVirtualKey(Ord('R'), 0), KEYEVENTF_KEYUP, 0);
keybd_event(VK_LWIN, MapVirtualKey(VK_LWIN, 0), KEYEVENTF_KEYUP, 0)