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Session support commands
Session support commands allow you to establish a logical connection (session)
on the network, send and receive messages, end sessions, and obtain session
status. More than one command can be outstanding because the connection is in
two-way simultaneous transmission mode.

Sessions are established between any two names on the network. These names can
be on your adapter or any other adapter. Names are used to establish sessions,
but a 1 byte number is used to refer to each session after they are
established. This number is found in the NCB LSN field that is returned when a
session is established. The number of sessions that each NETBIOS
implementation can support varies. For the maximum values, refer to the
specific NETBIOS implementation that you are using. The same name pair can be
used to establish more than one session. The difference between the session
pairs is the different LSN fields. If you create a local session, two session
entries are used instead of one. One side of the local session has one LSN
number associated with it, and the other side hs a different local session
number (NCB_LSN) number. To establish a session with yourself, make the fields
NCB_CALLNAME and NCB_NAME, equal.
Session support provides end-to-end data transfer of messages up to 65,535
bytes in length. The Reset command immediately ends all sessions.