INT 31H 0602H: Mark Real-Mode Region as Pageable

                                                    Compatibility: DPMI 0.9+ 
 Expects: AX    0602H
          BX:CX starting linear address of memory to mark as pageable
          SI:DI size, in bytes, of region to mark
 Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
    Info: Advises the DPMI host that the specified memory below the 1 MB
          boundary may be paged to disk.

          You must mark only the conventional memory pages that you own --
          such as memory from INT 31H 0100H or allocated via DOS fn 48H.

          Use INT 31H 0603H (relock real-mode region) to get these pages
          back into memory.

See Also: DPMI API
          INT 2fH: Multiplex Interrupt
          DOS Functions