BSD 2.11 - man page for talkd (bsd section 8)
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talkd - remote user communication server
Talkd is the server that notifies a user that somebody else wants to initiate a conversa-
tion. It acts a repository of invitations, responding to requests by clients wishing to
rendezvous to hold a conversation. In normal operation, a client, the caller, initiates a
rendezvous by sending a CTL_MSG to the server of type LOOK_UP (see <protocols/talkd.h>).
This causes the server to search its invitation tables to check if an invitation currently
exists for the caller (to speak to the callee specified in the message). If the lookup
fails, the caller then sends an ANNOUNCE message causing the server to broadcast an
announcement on the callee's login ports requesting contact. When the callee responds,
the local server uses the recorded invitation to respond with the appropriate rendezvous
address and the caller and callee client programs establish a stream connection through
which the conversation takes place.
4.3 Berkeley Distribution November 16, 1996 TALKD(8)
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