subroutine OS_QueryShiftKey(boolean: WasDown)

subroutine OS_QueryCtrlKey(boolean: WasDown)

subroutine OS_QueryAltKey(boolean: WasDown)

 

Returns whether the specified key was down when the last event happened.

# NB: If you call these subroutines in a loop, the loop must also contain a block. Without a block, no events will be processed, and the boolean will never change value.

A suitable block is...

make stimulus disposition all hold

begin guarded

   response to timeout -1

      leave block

end

make stimulus disposition all normal