Compatibility: DPMI 0.9+
Expects: AX    0600H
BX:CX starting linear address of memory to lock
SI:DI size, in bytes, of region to lock
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
                                                                  
Info: Locks a region of linear memory (thereby ensuring that it won't
be moved around or swapped out).

DPMI maintains a lock count.  You should use INT 31H 0601H to
unlock the region as soon as possible.

This also locks any partial page at the start and end of the
region.

See Also: DPMI API
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INT 31H 0600H: Lock Linear Region