Returns whether the left Shift key on the keyboard is held down. (Note: The Mac WoW client does not distingish between left and right modifier keys, so both Shift keys are reported as Left Shift.)
See also Keyboard functions.
Signature:
isDown = IsLeftShiftKeyDown()
Returns:
isDown- 1 if the left Shift key on the keyboard is currently held down; otherwise nil (1nil)