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A void based pointer must be explicitly combined with a segment value to
produce a reference to a memory location.  A void based pointer does not
infer its segment value from another object.  The :> (base) operator is used
to combine a segment value and a void based pointer.

For example, on a personal computer running DOS with a color monitor, the
screen memory begins at segment 0xB800, offset 0.  In a video text mode, to
examine the first character currently displayed on the screen, the following
code could be used:

Example:

     extern void main()
     {
         __segment             screen;
         char __based( void ) *scrptr;

         screen = 0xB800;
         scrptr = 0;
         printf( "Top left character is '%c'.\n",
                 *(screen:>scrptr) );
     }

The general form of the :> operator is:


     segment :> offset

where segment is an expression of type __segment, and offset is an
expression of type __based( void ) *.