By Carl Barnes

Summary: The Clarion KEYSTATE function returns the status of the "shift type" keys (Shift, Ctrl, Alt), the lock keys (Caps Lock, Num Lock, Scroll Lock), and the Insert key (overwrite or insert). It might sound like KEYSTATE isn’t good for much more than displaying information on the status bar, but in fact this function is a great tool for detecting unusual keystroke combinations (including when the numeric keypad has been used), which you can use to implement hidden features in your applications.

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