Int 21 Fn E900  - Novell Netware - Directory Services - Get Directory Han  [N]

   AX = E900h
   DX = drive number to check (0 = A:, ..., 25 = Z:, 26 ... 31)

Return: AL = directory handle
   AH = flags (drive not mapped if none set)
       bit 0: permanent handle
       bit 1: temporary handle
       bit 7: mapped to local drive

Note:  this function is supported by NetWare 4.0+, Advanced NetWare 1.0+, and
     Alloy NTNX

See Also: AH=E2h/SF=00h,AH=E2h/SF=01h,AH=E2h/SF=0Ah