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Network Working Group                                           G. MarcyRequest for Comments: 1096                    Carnegie Mellon University                                                              March 1989Telnet X Display Location OptionStatus 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 onRFC 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 = 352. 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.EDUMarcy                                                           [Page 3]