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     Run-time error R6001
 
     null pointer assignment
 
     The contents of the NULL segment have changed in the course of
     program execution. The program has written to this area, usually
     by an inadvertent assignment through a null pointer.
 
     The NULL segment is a location in low memory that is not normally
     used. The contents of the NULL segment are checked upon program
     termination. If a change is detected, this error is generated.
 
     Note that the program can contain null pointers without causing
     this error. The error appears only when the program writes to
     memory through a null pointer. It reflects a potentially serious
     error in the program. Although a program that produces this error
     may appear to operate correctly, it may cause problems in the
     future and may fail to run in a different operating environment.
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