Int 21 Fn 5F3C  u - LAN Manager Enhanced DOS - Nethandlegetinfo            [N]

   AX = 5F3Ch
   BX = handle
   CX = length of handle_info_1 structure
   DS:DX -> handle_info_1 structure (see AX=5F3Bh)
   SI = level of information (must be 0001h)

Return: CF clear if successful
       CX = total bytes available
   CF set if error
       AX = error code

See Also: AX=5F3Bh