[MWForum]Holding down a keyboard key during a MWPro game

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I know how to acknowledge when a player presses a keyboard key in MicroWorlds
Pro (using a procedure with readchar).  This is working well.  But is it
possible to know when the player is HOLDING DOWN a key for multiple
implementations of the function?  It would be great if I could allow him to
do this.   Ideas?  Thanks.  
Lisa Richter (forwarding this question from a student)