INT 31 P - DPMIsee DOS Protected-Mode Interface 0.9+ - MARK REAL MODE REGION AS PAGEABLE
	AX = 0602h
	BX:CX = starting linear address
	SI:DI = size of region in bytes
Return: CF clear if successful
	CF set on error
	    none of the memory is made pageable
	    AX = error code (DPMIsee DOS Protected-Mode Interface 1.0+) (8002h,8025h) (see #03143)
Notes:	must relock all unlocked real mode memory before terminating process
	  for DPMIsee DOS Protected-Mode Interface 0.9; DPMIsee DOS Protected-Mode Interface 1.0+ automatically relocks real mode memory
	pages at beginning and end will be unlocked if the region overlaps them
	pageability of real mode pages is binary, not a count
SeeAlso: AX=0600h,AX=0603h