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+Network Working Group                                          J. Postel
+Request for Comments: 866                                            ISI
+                                                                May 1983
+
+
+
+                              Active Users
+
+
+
+
+This RFC specifies a standard for the ARPA Internet community.  Hosts on
+the ARPA Internet that choose to implement an Active Users Protocol are
+expected to adopt and implement this standard.
+
+A useful debugging and measurement tool is an active users service.  An
+active users service simply sends a list of the currently active users
+on 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]
+