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- Network Working Group G. Marcy
- Request for Comments: 1096 Carnegie Mellon University
- March 1989
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- Telnet X Display Location Option
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- 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
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- Sender refuses to send the X display location.
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- IAC DO X-DISPLAY-LOCATION
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- Sender is willing to receive the X display location in a
- subsequent sub-negotiation.
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- Marcy [Page 1]
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- RFC 1096 Telnet X Display Location Option March 1989
-
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- 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
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- The X display location will not be exchanged.
-
- DON'T X-DISPLAY-LOCATION
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- 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:
-
-
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- Marcy [Page 2]
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- 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
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- Email: Glenn.Marcy@CS.CMU.EDU
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- Marcy [Page 3]
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