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AX = 1208h ES:DI -> SFT
Return:
AX = original value of reference count
Notes: If the reference count was 1, it is set to FFFFh ("busy", since 0 indicates that the SFT is not in use). It is the caller's responsibility to set the reference count to zero after cleaning up.. Used by network redirectors such as MSCDEX
See Also: AX=1106h
Category: DOS Kernel - Int 2Fh - D
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