Browse Prior Art Database

Telnet subliminal-message option (RFC1097)

IP.com Disclosure Number: IPCOM000001906D
Original Publication Date: 1989-Apr-01
Included in the Prior Art Database: 2000-Sep-12
Document File: 3 page(s) / 5K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

B. Miller: AUTHOR

Abstract

Status of this Memo

This text was extracted from a ASCII document.
This is the abbreviated version, containing approximately 55% of the total text.

Network Working Group B. Miller

Request for Comments: 1097 CMU-NetDev

1 April 1989

TELNET SUBLIMINAL-MESSAGE Option

Status of this Memo

This RFC specifies a standard for the Internet community. Hosts on

the Internet that display subliminal messages within the Telnet

protocol are expected to adopt and implement this standard.

Distribution of this memo is unlimited.

1. Command name and code.

SUBLIMINAL-MESSAGE 257

2. Command meanings.

IAC WILL SUBLIMINAL-MESSAGE

The sender of this command REQUESTS permission to, or confirms

that it will, display subliminal messages.

IAC WONT SUBLIMINAL-MESSAGE

The sender of this command REFUSES to display subliminal messages.

IAC DO SUBLIMINAL-MESSAGE

The sender of this command REQUESTS that the receiver, or grants

the receiver permission to, display subliminal messages.

IAC DONT SUBLIMINAL-MESSAGE

The sender of this command DEMANDS that the receiver not display

subliminal messages.

IAC SB SUBLIMINAL-MESSAGE <16-bit value> <16-bit value> IAC

SE

The sender specifies a message to be subliminaly displayed by the

remote host. If the client has agreed (via the standard WILL WONT

DO DONT mechanism) to display subliminal messages, it must accept

this subnegotiation and attempt to display the message string on

the users console for the specified duration and continue to do so

at fixed intervals until another SUBLIMINAL-MESSAGE subnegotiation

is received. The position and rendering of the message of

implementation dependent.

The first 16-bit value specifies the duration of the message in

milliseconds. It is sent MSB first. The second 16-bit value

specifies the frequency with which the message is displayed. It

represents the number of seconds between displays and is also sent

MSB first. The final parameter is the message itself.

The syntax for this subnegotiation is:

IAC SB SUBLIMINAL-MESSAGE

DURATION[1] DURATION[0]

FREQUENCY[1] FREQUENCY[0]

MESSAGE_STRING

IAC SE

As required by the Telnet protocol, any occurence of 255 in the

subnegotiation must be doubled to destinguish it from the IAC

character (which has a value of 255).

3. Default.

WONT SUBLIMINAL-MESSAGE

DONT SUBLIMINAL-MESSAGE

i.e., subliminal messages will not be displayed.

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