INT 21 - Novell NetWare shell 3.01 - GET RELATIVE DRIVE DEPTH
AX = E907h
BL = drive number (0=default, 1=A:, ...)
Return: AL = number of directories below the fake root
FFh if no fake root assigned

See also: 21E905

21E907 - Novell NetWare shell 3.01 - GET RELATIVE DRIVE DEPTH