Compatibility: DPMI 1.0+
Expects: AX     0507H
ESI    memory block handle (as obtained via INT 31H 0504H)
EBX    base offset of page(s) to modify
ECX    number of pages
ES:EDX address of buffer containing attributes to use
                                                                  
Returns: CF    NC (clear) if successful
else AX  = DPMI Error Code
ECX = number of pages that were modified
                                                                  
Info: This sets attributes of one or more pages within a block of
linear memory allocated via INT 31H 0504H.

This can be used to modify read/write attributes or commit an
uncommitted block, etc.

ES:EDX on entry, this buffer contains attribute settings, as described

See Also: DPMI API
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INT 31H 0507H: Set Page Attributes