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CHK_STACK()
   Checks the unused bytes in the stack.

   Syntax
         nStackLeft = CHK_STACK()

   Arguments
         None

   Returns
         None

   Description
         Recursive functions use the stack to store parameters. The stack can
         be overrun by recursive functions and cause strange problems to
         occur. CHK_STACK() reads the stack memory checking to see how much
         of the stack remains unused. It must be used with MARK_STACK().