Compatibility: DPMI 0.9+
Expects: AX    0700H
BX:CX starting linear address of pages to discard
SI:DI size, in bytes, of region to discard
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
                                                                  
Info: Discards the entire contents of a specified region of linear
memory.

This lets you optimize virtual memory access.  When a memory area
will not be needed again, discard it.  That way, the DPMI Host
won't bother swapping it to disk.

See Also: DPMI API
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INT 31H 0701H: Discard Page Contents