RFC 1921 TNVIP Protocol March 1996 6.4. Screen data purge indication message . . . . . . . 17 7. The printer flow . . . . . . . . . . . . . . . . . . 17 7.1. Printer data messages . . . . . . . . . . . . . . . 17 7.2. Printer response messages . . . . . . . . . . . . . 18 7.3. 7800 printer status management . . . . . . . . . . 19 7.4. Printer state request message . . . . . . . . . . 20 7.5. Printer state response messages . . . . . . . . . . 20 7.6. Printer purge indication message . . . . . . . . . 20 8. The Screen Copy Printing flow . . . . . . . . . . . 21 8.1. Screen copy request messages . . . . . . . . . . . 21 8.2. Screen copy data message . . . . . . . . . . . . . 21 8.3. Screen copy response messages . . . . . . . . . . . 22 8.4. Screen copy purge indication message . . . . . . . 23 9. The TM attention . . . . . . . . . . . . . . . . . . 23 10. The Break Key . . . . . . . . . . . . . . . . . . . 24 11. The Logout Key . . . . . . . . . . . . . . . . . . . 24 12. TNVIP messages list . . . . . . . . . . . . . . . . 24 12.1. Screen Flow . . . . . . . . . . . . . . . . . . . . 24 12.2. Printer flow . . . . . . . . . . . . . . . . . . . 26 12.3. Screen Copy Printing messages flow . . . . . . . . 28 13. Security Considerations . . . . . . . . . . . . . . 29 14. References . . . . . . . . . . . . . . . . . . . . . 30 15. Author's Address . . . . . . . . . . . . . . . . . . 30 1. Motivation P200 [7] and 7800 [8] VIP (Visual Information Projection) terminals differ mainly from NVT terminals [1] in that they work in block mode and have the capability to manage an associated printer. Generally in a DSA (Distributed Systems Architecture) network they are managed through the VIP transmission line procedure (character oriented). That is the reason why they are generically referred as VIP terminals. This document specifies the options to be modified successfully, to pass from the NVT terminal emulation supported on a Telnet connection, to a VIP terminal emulation. It defines also the format of the messages exchanged between the server and the client when the TNVIP protocol is successfully negotiated. Dujonc Informational