Compatibility: DPMI 0.9+
Expects: AX    0603H
BX:CX starting linear address of memory to relock
SI:DI size, in bytes, of region to relock
                                                                  
Returns: CF    NC (clear) if successful; else AX = DPMI Error Code
                                                                  
Info: Relocks a memory region that was previously declared pageable via
a previous call to INT 31H 0602H (mark real-mode region as
pageable).

See Also: DPMI API
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INT 31H 0603H: Relock Real-Mode Region