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Format of XMS handle info record

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Offset Size Description

00h

WORD

handle

02h

WORD

flags
bit 0 : handle usable by Windows (already in use when Windows started if clear)
bit 1 : reserved (0)

04h

DWORD

size in KB (may be zero, used only if flags bit 0 set)

08h

DWORD

physical address (only if flags bit 0 set)