DosCLIAccess

#define INCL_DOSDEVICES

USHORT  rc = DosCLIAccess(VOID);


USHORT           rc;            /* return code */

Example 

This example requests I/O privilege for disabling and enabling interrupts. 

#define INCL_DOSDEVICES

USHORT rc;

   rc = DosCLIAccess();      /* Request I/O privilege */