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Network Working Group                                          J. PostelRequest for Comments: 866                                            ISI                                                                May 1983Active UsersThis RFC specifies a standard for the ARPA Internet community.  Hosts onthe ARPA Internet that choose to implement an Active Users Protocol areexpected to adopt and implement this standard.A useful debugging and measurement tool is an active users service.  Anactive users service simply sends a list of the currently active userson the host without regard to the input.An active user is one logged in, such as listed in SYSTAT or WHO.TCP Based Active Users Service   One active users service is defined as a connection based application   on TCP.  A server listens for TCP connections on TCP port 11.  Once a   connection is established a list of the currently active users is   sent out the connection (and any data received is thrown away).  The   service closes the connection after sending the list.UDP Based Active Users Service   Another active users service service is defined as a datagram based   application on UDP.  A server listens for UDP datagrams on UDP port   11.  When a datagram is received, an answering datagram is sent   containing a list of the currently active users (the data in the   received datagram is ignored).   If the list does not fit in one datagram then send a sequence of   datagrams but don't break the information for a user (a line) across   a datagram.  The user side should wait for a timeout for all   datagrams to arrive.  Note that they are not necessarily in order.User List Syntax   There is no specific syntax for the user list.  It is recommended   that it be limited to the ASCII printing characters, space, carriage   return, and line feed.  Each user should be listed on a separate   line.Postel                                                          [Page 1]