Category: <b>DOS extenders</b>
<br>Flags: available only in protected mode<p>
<pre><b>INT 31 - CauseWay - "UnLockMemNear" - UNLOCK APP-RELATIVE MEMORY REGION</b>

	AX = FF20h
	ESI = starting application-relative linear address
	ECX = size of region in bytes
Return: CF clear if successful
	CF set on error
Desc:	allow memory to be swapped out by the virtual memory manager
Note:	locks are applied on 4K page boundaries, so memory above and below
	  the specified region may be unlocked as well
SeeAlso: AX=FF1Eh,AX=FF1Fh
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