Commits or decommits a range of pages within a memory object, or alters their access protection.

#define INCL_DOSMEMMGR
#include <os2.h>

PVOID     pb;    /*  The base address of the range of pages whose attributes are to be changed. */
ULONG     cb;    /*  A value specifying the size, in bytes, of the region whose attributes are to be changed. */
ULONG     flag;  /*  A set of flags specifying commitment or decommitment, and desired access protection, for the specified range of pages. */
APIRET    ulrc;  /*  Return Code. */

ulrc = DosSetMem(pb, cb, flag);