NIL                         Empty Pointer Value                      pp 121


 Define:  Nil is a predefined identifier used to assign 'no value'
          to an undefined pointer.

 Purpose: Provides a standard value that can be tested to determine if a
          pointer has been assigned an address.

 Notes:   Nil Segment:Offset value is 0000:0000.


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 Usage:
       TYPE
          PtrType = ^Integer;   { Declare a pointer to Integer data   }

       VAR
          IntPtr  : PtrType ;   { IntPtr is a pointer of type PtrType }

       BEGIN
          IntPtr  := Nil    ;   { IntPtr now points at nothing        }
       END.