A variable of type RAW or MEMPTR. If destination is the Unknown value (
?), it remains the Unknown value (
?). If 
destination is a MEMPTR and its region in not allocated (by a SET-SIZE statement or by a Windows dynamic link library (DLL) or UNIX shared library routine), the AVM generates a run-time error.
 
      For a RAW destination, if
 position is greater than the length of 
destination, the AVM increases the length of 
destination to 
position plus the remaining bytes needed to store 
expression. The gap between the original 
destination length and 
position is padded with null bytes. 
 
      For a MEMPTR destination, if 
position is greater than the length of 
destination or does not leave sufficient room to store 
expression, the AVM generates a run-time error.