Category: <b>DOS extenders</b>
<br>Flags: available only in protected mode<p>
<pre><b>INT 31 - CauseWay - "LockMem" - LOCK REGION OF MEMORY</b>

	AX = FF1Bh
	BX:CX = starting linear address
	SI:DI = size of region in bytes
Return: CF clear if successful
	CF set on error
Desc:	prevent memory from being 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 locked as well
SeeAlso: AX=FF1Ch,AX=FF1Dh
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