NWG/RFC# 736 MRC 31-OCT-77 23:28 42213 Telnet SUPDUP Option Network Working Group Mark Crispin Request for Comments 736 SU-AI NIC 42213 31 October 1977 TELNET SUPDUP Option 1. Command name and code. SUPDUP 21 2. Command meanings. IAC WILL SUPDUP The sender of this command REQUESTS permission to, or confirms that it will, use the SUPDUP display protocol IAC WON'T SUPDUP The sender of this command REFUSES to use the SUPDUP protocol. IAC DO SUPDUP The sender of this command REQUESTS that the receiver use, or grants the receiver permission to use, the SUPDUP protocol. IAC DON'T The sender of this command DEMANDS that the receiver not use the SUPDUP protocol. 3. Default. WON'T SUPDUP DON'T SUPDUP i.e., the SUPDUP display protocol is not in use. Mark Crispin [page 1]