How do I restrict telnet?

Mon Apr 15 09:15:22 AEST 1991

Does anyone out there know how to restrict telnet to a single site?  We need to set up a user on our system to call another machine and _not allow_ the person 
to close the connection and call somewhere else or shell out.  Any ideas?

Thanx

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James Scott                                              jscott at isis.UUCP
                                                  scott at gwhs.colorado.edu