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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
Category: DOS Extenders - Int 31h - C
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