INT 21 - Novell NetWare - DIRECTORY SERVICES - GET VOLUME NUMBER
        AH = E2h subfn 05h
        DS:SI -> request buffer (see below)
        ES:DI -> reply buffer (see below)
Return: AL = status (00h,98h) (see AH=E2h/SF=00h)
Notes:  this function is supported by NetWare 4.0+, Advanced NetWare 1.0+, and
          Alloy NTNX
SeeAlso: AH=DAh,AH=E2h/SF=02h,AH=E2h/SF=05h,AH=E2h/SF=15h,AH=E3h/SF=E9h

Format of request buffer:
Offset  Size    Description
 00h    WORD    length of following data (max 12h)
 02h    BYTE    05h (subfunction "Get Volume Number")
 03h    BYTE    length of volume name (01h-10h)
 04h  N BYTEs   volume name

Format of reply buffer:
Offset  Size    Description
 00h    WORD    (call) 0001h (length of following results buffer)
 02h    BYTE    volume number

.