Browse Prior Art Database

Telnet SUPDUP-Output option (RFC0749)

IP.com Disclosure Number: IPCOM000003796D
Original Publication Date: 1978-Sep-18
Included in the Prior Art Database: 2000-Sep-13
Document File: 4 page(s) / 9K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Greenberg: AUTHOR

Abstract

1. Command name and code.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 34% of the total text.

NWG/RFC 749 BSG 26-Sep-78 13:13 45499

Network Working Group Bernard Greenberg

Request for Comments 749 MIT-Multics

NIC 45499 18 September 1978

Telnet SUPDUP-OUTPUT Option

1. Command name and code.

SUPDUP-OUTPUT 22

2. Command meanings.

IAC WILL SUPDUP-OUTPUT

The sender of this command REQUESTS permission to transmit

SUPDUP-OUTPUT format messages over the TELNET connection.

IAC WON'T SUPDUP-OUTPUT

The sender of this command STATES that he will no longer send

SUPDUP-OUTPUT format messages over the TELNET connection.

IAC DO SUPDUP-OUTPUT

The sender of this command grants the receiver permission to send

SUPDUP-OUTPUT format messages over the TELNET connection.

IAC DON'T SUPDUP-OUTPUT

The sender of this command DEMANDS that the receiver not send

SUPDUP-OUTPUT format messages over the TELNET connection.

IAC SB SUPDUP-OUTPUT 1 IAC SE

The sender of this command (which must be the TELNET user process) is

supplying information describing the capabilities of the user

process' terminal.

IAC SB SUPDUP-OUTPUT 2 n TD1 TD2 .. TDn SCx SCy IAC SE

The sender of this command, which must be the TELNET server process,

is sending explicit screen control information to be carried out by

the user TELNET process.

3. Default.

WON'T SUPDUP-OUTPUT

DON'T SUPDUP-OUTPUT

i.e., the SUPDUP-OUTPUT format messages may not be transmitted.

NWG/RFC 749 BSG 26-Sep-78 13:13 45499

Telnet SUPDUP-OUTPUT Option

4. Motivation for the option.

The SUPDUP-OUTPUT protocol provides a means to access the virtual

display support provided by the SUPDUP protocol (see RFC 734) within

the context of a standard TELNET connection. This allows occasional

display-oriented programs at non-display-oriented servers to take

advantage of the standardized display support provided by SUPDUP.

This cannot be done with the standard SUPDUP protocol or the TELNET

SUPDUP option (RFC 736), for they both require that all communication

after the negotiation to use SUPDUP has been completed proceed

according to the protocol of RFC 734. This places upon the server

total responsibility for screen management for the duration of the

connection, which, by hypothesis, the non-display oriented server is

not willing to accept.

User TELNET programs at display-oriented user hosts provide local

screen management by mapping the NVT commands of TELNET into local

screen management commands; often, this involves scrolling,

end-of-page processing, line clearing etc. The SUPDUP-OUTPUT option

allows a display-oriented application program at the server side to

take over screen management explicitly, via the SUPDUP display

control repertoi...