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Using IDLE Procedures
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 Do not overlay IDLE procedures.  Although they will overlay without error
 messages from WarpLink, they cannot be marked as inactive by the overlay
 manager when they finish execution. This overloads the overlay pool, 
 forcing more active overlay swap-outs and hurting program performance,
 probably significantly.  The problem increases each time the overlaid IDLE
 procedure is called and eventually leads to program failure.