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MARK_STACK()
   Marks the stack.

   Syntax
         MARK_STACK()

   Arguments
         None

   Returns
         None

   Description
         Recursive functions use the stack to store parameters. The stack can
         be overrun and cause strange problems to occur. MARK_STACK() writes
         a 'J' to the stack memory. When the program finishes running, the
         stack can be checked with CHK_STACK() to see how much of the stack
         remains unused.