Int 6A Fn 03  - Decnet Dos Local Area Transport - Status                   [N]

   AH = 03h
   DH = FFh
   DL = handle

Return: AH = status flags (see #3397)

Bitfields for DECnet DOS LAT status flags:
Bit(s) Description (Table 3397)
 5 transmit buffer empty
 3 session in start state
 2 session not active
 1 unable to queue transmit data
 0 receive data available