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+Network Working Group                                           G. Marcy
+Request for Comments: 1096                    Carnegie Mellon University
+                                                              March 1989
+
+
+                    Telnet X Display Location Option
+
+Status of This Memo
+
+   This RFC specifies a standard for the Internet community.  Hosts on
+   the Internet that transmit the X display location within the Telnet
+   protocol are expected to adopt and implement this standard.
+   Distribution of this memo is unlimited.
+
+   This standard is modelled on RFC 1079 [1], the telnet terminal speed
+   option.  Much of the text of this document is copied from that RFC.
+
+Motivation
+
+   When a user is running the Telnet client under the X window system,
+   it is useful for the remote Telnet to know the X display location of
+   that client.  For example, the user might wish to start other X
+   applications from the remote host using the same display location as
+   the Telnet client.  The purpose of this option is to make this
+   information available through telnet connections.
+
+1. Command Name and Code
+
+      X-DISPLAY-LOCATION (XDISPLOC)
+
+      Code = 35
+
+2. Command Meanings
+
+      IAC WILL X-DISPLAY-LOCATION
+
+         Sender is willing to send the X display location in a
+         subsequent sub-negotiation.
+
+      IAC WON'T X-DISPLAY-LOCATION
+
+         Sender refuses to send the X display location.
+
+      IAC DO X-DISPLAY-LOCATION
+
+         Sender is willing to receive the X display location in a
+         subsequent sub-negotiation.
+
+
+
+
+Marcy                                                           [Page 1]
+
+RFC 1096            Telnet X Display Location Option          March 1989
+
+
+      IAC DON'T X-DISPLAY-LOCATION
+
+         Sender refuses to accept the X display location.
+
+      IAC SB X-DISPLAY-LOCATION SEND IAC SE
+
+         Sender requests receiver to transmit his (the receiver's) X
+         display location.  The code for SEND is 1.  (See below.)
+
+      IAC SB X-DISPLAY-LOCATION IS ... IAC SE
+
+         Sender is stating his X display location.  The code for IS is
+         0.  (See below.)
+
+3. Default
+
+      WON'T X-DISPLAY-LOCATION
+
+         The X display location will not be exchanged.
+
+      DON'T X-DISPLAY-LOCATION
+
+         The X display location will not be exchanged.
+
+4. Description of the Option
+
+   WILL and DO are used only to obtain and grant permission for future
+   discussion.  The actual exchange of status information occurs within
+   option subcommands (IAC SB X-DISPLAY-LOCATION...).
+
+   Once the two hosts have exchanged a WILL and a DO, the sender of the
+   DO X-DISPLAY-LOCATION is free to request the X display location.
+   Only the sender of the DO may send requests (IAC SB X-DISPLAY-
+   LOCATION SEND IAC SE) and only the sender of the WILL may transmit
+   actual X display location (within an IAC SB X-DISPLAY-LOCATION IS ...
+   IAC SE command).  The X display location may not be sent
+   spontaneously, but only in response to a request.
+
+   The X display location is an NVT ASCII string.  This string follows
+   the normal Unix convention used for the DISPLAY environment variable,
+   e.g.,
+
+         <host>:<dispnum>[.<screennum>]
+
+   No extraneous characters such as spaces may be included.
+
+      The following is an example of use of the option:
+
+
+
+
+Marcy                                                           [Page 2]
+
+RFC 1096            Telnet X Display Location Option          March 1989
+
+
+         Host1: IAC DO X-DISPLAY-LOCATION
+
+         Host2: IAC WILL X-DISPLAY-LOCATION
+
+      (Host1 is now free to request status information at any time.)
+
+         Host1: IAC SB X-DISPLAY-LOCATION SEND IAC SE
+
+         Host2: IAC SB X-DISPLAY-LOCATION IS "SRI-NIC.ARPA:0.0" IAC SE
+
+      (This command is 22 octets.)
+
+5. Implementation Suggestions
+
+   Since the X display location may not contain a hostname on the client
+   host, i.e., ":0" or "unix:0.0", the Telnet client will need to modify
+   the location appropriately before sending it on to the remote Telnet.
+
+Reference
+
+   [1]  Hedrick, C., "Telnet Terminal Speed Option", RFC 1079,
+        Rutgers University, December, 1988.
+
+Author's Address:
+
+   Glenn A. Marcy
+   Carnegie Mellon University
+   School of Computer Science
+   Pittsburgh, PA 15213-3890
+
+   Phone: (412) 268-7669
+
+   Email: Glenn.Marcy@CS.CMU.EDU
+
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+Marcy                                                           [Page 3]
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