buttons to test for, OR'ed
    together with NOR<br>
  </blockquote><b>Return</b>

  <blockquote>
    None.
  </blockquote><b>Remarks</b>

  <blockquote>
    Waits for any button in mask to change state (be pressed or be
    released). This is a good method of just waiting for a button
    press or release when you already know the state of the button.
  </blockquote><b>See Also</b>

  <blockquote>
    <a href="Input_WAITKEY.htm">WAITKEY</a>
  </blockquote>
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