Does anyone out there know of a way to get the state of either of these 2 keys.

I have a window that reacts differently depending is the Shift key is pressed. This works just fine unless the user:-
1) releases the key in the window
2) switches to another window where they press the key in anticipation then
3) select the window that is looking for the Shift status

there appears to be no way of knowing that they have the key pressed as they select the window.

Anyone got a any thoughts?