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- NETWORK WORKING GROUP R.Thomas
- REQUEST FOR COMMENTS #339 BBN
- N.I.C. #9932 May 5,1972
-
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- MLTNET - A "MULTI-TELNET" SUBSYSTEM FOR TENEX
-
- INTRODUCTION
-
- MLTNET is a TELNET-like facility for TENEX which enables a user to
- control a number of jobs, running on different ARPANET hosts. It
- multiplexes the user's local console among the remote jobs. MLTNET is
- useful in applications which require coordinated behavior of several
- network hosts. In particular, we have found it helpful in debugging
- programs which make use of the network. The MLTNET program is designed
- to be easy to use and, while used in remote mode, to be as transparent
- as possible to the user. It is somewhat less sophisticated than the
- TENEX user-TELNET program. MLTNET is currently a subsystem on the BBN-
- TENEX host.
-
- USING MLTNET
-
- MLTNET operates in two modes:
-
- 1. Local Mode Operation:
- When in local mode MLTNET interprets input types by the
- user as commands to it. Commands consist of a mnemonic
- command name followed by zero or more parameters.
- Included in the commands recognized by MLTNET are ones
- which enable the user to associate a name of his choice
- with a connection to an ARPANET site, to establish a
- connection with a named site, to list the network status
- as seen from the user's TENEX etc.
-
- 2. Remote Mode Operation
- When operating in remote mode MLTNET makes the user's
- console appear to be directly connected to a remote
- site. It transmits input typed by the user to the
- remote site and prints output recieved from the remote
- site. Output received from a remote site while the user
- is in local mode or is interacting with another remote
- site is buffered for the user by MLTNET.
-
- MLTNET has been designed to be transparent to the user
- while operating in remote mode. In particular, when in
- remote mode it transmits user-types ^C (CONTROL-C, the
- TENEX "attention" character) and ^T (CONTROL-T, the
- TENEX "time used query" character) to the remote site.
-
-
-
- [Page 1]
-
- When in local mode ^C and ^T have their usual TENEX
- effect.
-
- Occasinally a user may find it necessary to modify the
- characteristics of a connection to a particular remote
- site. For example, he may want to have MLTNET echo
- typed input as it is transmitted. Or, he may be using a
- remote host which requires both upper and lower case
- characters from a local terminal which has only upper
- case; in such a case he would want MLTNET to transmit
- upper and lower case as appropriate. In remote mode
- operation MLTNET recognizes "!" as an escape character
- and interprets the character following it as a command
- to change the characterristics of the connection currently
- in use. Commands recognized by MLTNET in remote mode
- are summerized in the next section. To have MLTNET
- transmit "!" to the remote site the user types "!!".
-
- MLTNET Command Summary
-
- Local Mode Commands
-
- MLTNET uses the character "<" to signal the user that it is in local
- mode ready to accept input. Commands and command parameters may be
- editted as they are input.The character ^A (CONTROL-A) deletes the last
- character input. In response to a ^A MLTNET types " deleted. The
- character ^R (CONTROL-R) causes the input string as collected so far to
- be retyped (with all editting carried out). MLTNET responds to the
- character RUBOUT (octal 177) by aborting the current input collecting
- operation and typeing the ready character "<". The ALTMODE character
- (octal 175) may be used to invoke command recognition and completion. If
- insufficient information is availble to recognize an input string as a
- command MLTNET responds to ALTMODE by ringing the terminal bell. Any
- prefix which uniquely identifies a command is recognized as that command
- by MLTNET.
-
- In the following, <name> and <site> denote command parameters. They are
- strings terminated by a space or carriage return. <name> is a user
- chosen string of 14 characters or less; site is either the name of an
- ARPANET host or the string "LOCAL".
-
- The commands recognized by MLTNET in local mode are:
-
- ASSIGN:
- syntax: ASSIGN <name> <site>
- effect: Associates the user chosen string <name> with a
- connection to the ARPANET site <site>.
-
-
-
-
- [Page 2]
-
- TALK:
- syntax: TALK <name>
- effect: Switches from command mode to remote mode
- directing subsequent console input to the site
- associated with <name>. If no ARPANET site is
- currently associated with <name>, the user is
- asked to spesify a site. The first time the
- user "talks" to a particular named site MLTNET
- goes through the ARPANET initial connection
- protocol with the remote site in order to
- establish a duplex connection with it.
-
- NAMES:
- syntax: NAMES
- effect: Prints on the console the <name>/<site>
- associatins currently known to MLTNET.
-
- QUIT:
- syntax: QUIT
- effect: Returns control to the TENEX EXEC breaking all
- connections with remote hosts. It is good
- practice to log out of each remote host before
- using the QUIT command.
-
- NETSTAT:
- syntax: NETSTAT
- effect: Prints on the console the network status as seen
- from the local TENEX.
-
- RENAME:
- syntax: RENAME <name>1 <name>2
- effect: Associates <name>2 with the ARPANET site
- previously associated with <name>1.
-
- FLUSH:
- syntax: FLUSH <name>
- effect: Breaks the network connection with the ARPANET
- site associated with <name> and, in addition,
- breaks the association between <name> and that
- site.
-
- HOSTS:
- syntax: HOSTS
- effect: Prints on the console the list of hosts
- currently known to the MLTNET subsystem.
-
- HELP:
- syntax: HELP
-
-
-
- [Page 3]
-
- effect: Prints on the console a breif summary of how to
- use MLTNET.
-
- Remote Mode Commands
-
- In remote mode MLTNET recognizes the escape character "!" as a signal to
- interpret the following character as a command. Currently MLTNET
- recognizes the following characters as commands to it:
-
- Q: (quit) Causes MLTNET to switch from remote mode to local
- mode.
-
- L: (local echo) Causes MLTNET to echo characters as it
- transmits them to the remote site. ;L is the inverse of
- R. The default case.
-
- R: (remote echo) Causes MLTNET to transmit characters typed
- to it without echoing them; invers of L.
-
- U: (upper case) Causes MLTNET to transmit upper case letters
- as typed; the inverse of S. The default case.
-
- S: (small letters - lower case): Causes MLTNET to transmit
- upper case letters typed to it as lower case letters.
- In this mode of operation "^" acts as a shift key; "^"
- may be transmitted by typing "!^". S is the inverse of
- U.
-
- X: (where X is any character other than Q, L, R, U or S):
- Causes MLTNET to transmit X.
-
- The following is an annotated scenario which illustrates the use of
- MLTNET; in it characters typed by the users are underlined.
-
-
- [ This RFC was put into machine readable form for entry ]
- [ into the online RFC archives by Tor Fredrik Aas 1/98 ]
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- [Page 4]
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