Compatibility: DPMI 0.9+
Expects: AX    0601H
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: Unlocks a region of linear memory that was previously locked via
INT 31H 0600H (thereby allowing it to be moved around or swapped
out).

DPMI maintains a lock count.  The region is not unlocked until
the lock count is decremented to 0.

See Also: DPMI API
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INT 31H 0601H: Unlock Linear Region