// Header Declared in Winuser.h, include Windows.h 
// Import library User32.lib 
 
 
// Look for a shift key to be pressed.
// '& 0x8000' tests the high-order bit. 1=key is down; 0=up.
// '!!' will bool-ize the result.
bool shift = !!( ::GetKeyState(VK_SHIFT) & 0x8000 );