Int 6F Fn 18 - 10net V3.3+ - Unmount [N]
AH = 18h
AL = local drive number (0=A:)
BL = type
00h disk
01h-03h LPTn
04h,05h COMx
Return: CF clear if successful
CF set on error
AX = error code (see AH=00h)
See Also: AH=17h
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