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BSD 2.11 - man page for comsat (bsd section 8)

COMSAT(8)						      System Manager's Manual							 COMSAT(8)

comsat - biff server
Comsat is the server process which receives reports of incoming mail and notifies users if they have requested this service. Comsat receives messages on a datagram port associated with the ``biff'' service specification (see services(5) and inetd(8)). The one line mes- sages are of the form user@mailbox-offset If the user specified is logged in to the system and the associated terminal has the owner execute bit turned on (by a ``biff y''), the offset is used as a seek offset into the appropriate mailbox file and the first 7 lines or 560 characters of the message are printed on the user's terminal. Lines which appear to be part of the message header other than the ``From'', ``To'', ``Date'', or ``Subject'' lines are not included in the displayed message.
/var/run/utmp to find out who's logged on and on what terminals
biff(1), inetd(8)
The message header filtering is prone to error. The density of the information presented is near the theoretical minimum. Users should be notified of mail which arrives on other machines than the one to which they are currently logged in. The notification should appear in a separate window so it does not mess up the screen. 4.2 Berkeley Distribution November 16, 1996 COMSAT(8)