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NETWORK WORKING GROUP                                   R.ThomasREQUEST FOR COMMENTS #339                               BBNN.I.C. #9932                                            May 5,1972MLTNET - A "MULTI-TELNET" SUBSYSTEM FOR TENEXINTRODUCTIONMLTNET is a TELNET-like facility for TENEX which enables a user tocontrol a number of jobs, running on different ARPANET hosts. Itmultiplexes the user's local console among the remote jobs. MLTNET isuseful in applications which require coordinated behavior of severalnetwork hosts.  In particular, we have found it helpful in debuggingprograms which make use of the network. The MLTNET program is designedto be easy to use and, while used in remote mode, to be as transparentas possible to the user. It is somewhat less sophisticated than theTENEX user-TELNET program. MLTNET is currently a subsystem on the BBN-TENEX host.USING MLTNETMLTNET 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 SummaryLocal Mode CommandsMLTNET uses the character "<" to signal the user that it is in localmode ready to accept input. Commands and command parameters may beeditted as they are input.The character ^A (CONTROL-A) deletes the lastcharacter input. In response to a ^A MLTNET types " deleted. Thecharacter ^R (CONTROL-R) causes the input string as collected so far tobe retyped (with all editting carried out). MLTNET responds to thecharacter RUBOUT (octal 177) by aborting the current input collectingoperation and typeing the ready character "<". The ALTMODE character(octal 175) may be used to invoke command recognition and completion. Ifinsufficient information is availble to recognize an input string as acommand MLTNET responds to ALTMODE by ringing the terminal bell. Anyprefix which uniquely identifies a command is recognized as that commandby MLTNET.In the following, <name> and <site> denote command parameters. They arestrings terminated by a space or carriage return. <name> is a userchosen string of 14 characters or less; site is either the name of anARPANET 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 CommandsIn remote mode MLTNET recognizes the escape character "!" as a signal tointerpret the following character as a command.  Currently MLTNETrecognizes 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 ofMLTNET; 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 ]                                                                [Page 4]