Int 16 Fn 4501  - Shamrock Software Email - Get Elapsed Online Time And M  [e]

   AX = 4501h
   DL = port number (01h = COM1)

Return: AX = 4D00h if EMAIL installed on specified port
       BX = maximum connect time in clock ticks
       CX = maximum connect time for guests (without name) in clock ticks
       DX = elapsed connect time of current user in clock ticks

See Also: AX=4500h