668     EVAL STACK FAULT

     Explanation:  The evaluation stack expanded into a locked VMM
     segment.  The CA-Clipper VM System will use the DGROUP Free Space when
     conventional DOS memory is very low.

     Action:  Free up conventional DOS memory by reducing the
     application's load size and/or increasing free DOS memory as reported by
     DOS's MEM.EXE command.

     Note: There could be an error in the runtime error handler.

     See Also:  Error 650.