INT 31 P - DPMI 0.9+ - MARK PAGE AS DEMAND PAGING CANDIDATE
        AX = 0702h
        BX:CX = starting linear address
        SI:DI = number of bytes to mark as paging candidates
Return: CF clear if successful
        CF set on error
            AX = error code (DPMI 1.0+) (8025h) (see AX=0000h)
Notes:  this function is advisory, and does not force immediate paging
        partial pages will not be discarded
SeeAlso: AX=0703h