Retrieve system performance information.

#define INCL_BASE
#include <os2.h>

ULONG     ulCommand;  /*  Command */
ULONG     ulParm1;    /*  Command specific parameter 1 */
ULONG     ulParm2;    /*  Command specific parameter 2 */
ULONG     ulParm3;    /*  Command specific parameter 3 */
APIRET    ulrc;       /*  Return Code. */

ulrc = DosPerfSysCall(ulCommand, ulParm1,
         ulParm2, ulParm3);