DosSubFree

#define INCL_DOSMEMMGR

USHORT  rc = DosSubFree(SegSelector, BlockOffset, Size);

SEL              SegSelector;   /* Segment selector */
USHORT           BlockOffset;   /* Offset of memory block to free */
USHORT           Size;          /* Size of block in bytes */

USHORT           rc;            /* return code */