RFC 1408 (rfc1408) - Page 3 of 7

Telnet Environment Option

RFC 1408               Telnet Environment Option            January 1993


   IAC SB ENVIRON INFO type ... [ VALUE ... ] [ type ... [ VALUE ... ] [

   The sender of this command is sending information about environment
      variables that have changed.  It is identical to the IS command,
      except that the command is INFO instead of IS.  Only the side that
      is WILL ENVIRON may send an INFO command.  The INFO command is not
      to be used to send initial information; the SEND/IS sequence is to
      be used for that.  The INFO command is to be used to propagate
      changes in environment variables, and may be spontaneously
      generated.

3.  Default Specification

   The default specification for this option is

      WONT ENVIRON
      DONT ENVIRON

   meaning there will not be any exchange of environment information.

4.  Motivation

   Many operating systems have startup information and environment
   variables that contain information that should be propagated to
   remote machines when Telnet connections are established.  Rather than
   create a new Telnet option each time someone comes up with some new
   information that they need propagated through a Telnet session, but
   that the Telnet session itself doesn't really need to know about,
   this generic information option can be used.

5.  Well Known Variables

   USER        This variable is used to transmit the user or account
               name that the client wishes to log into on the remote
               system.  The format of the value the USER variable is
               system dependent, as determined by the remote system.

   JOB         This variable is used to transmit the job ID that the
               client wishes to use when logging into the remote system.
               The format of the value the JOB variable is system
               dependent, as determined by the remote system.

   ACCT        This variable is used to transmit the account ID that the
               client wishes to use when logging into the remote system.
               The format of the value the ACCT variable is system
               dependent, as determined by the remote system.





Telnet Working Group