3. Gateways and networks

------------------------ CompuServe users select the Computer Database Plus from a menu. This prompts CompuServe to dial another online service and lets you use this, as if you were still using CompuServe. You hardly notice the difference. You are using Computer Database Plus through a gateway. CompuServe users searching the IQuest databases get the following welcome message: One moment please... Connected to 19EASYN Welcome to IQuest (c) 1991 Telebase Systems, Inc. U.S. Patent No. 4,774,655 Through another gateway, CompuServe connects you to the online service Telebase Systems, Inc. Telebase lets you go through other gateways to search in databases on online services like BRS, MEDLINE and NewsNet. While searching, you may get similar progress reports: Dialing BRS Connect BRS Scanning .... Please wait Dialing Medline Connect Medline Scanning .... Please wait All the time, your modem is connected to CompuServe. You are mentally using IQuest and not other online services. Technically, you are going through various gateways to reach the information libraries. You pay CompuServe for the privilege. In turn, they pay a fee to Telebase, and others. You can read The New York Times on Down Jones News/Retrieval through gateways from MCI Mail and GEnie. Accessing information through a gateway is often simpler than logging on to several online systems. Calling several systems often costs more, and it certainly takes time. Users of BBSes connected to RelayNet or FidoNet can join in global discussions. Participants in other countries also call their favorite local systems. To the individual user, it looks as if they all use the same bulletin board system. The networks that tie these boards together regularly send new discussion items to the other participating boards. Write "This is not correct!" in a distributed conference on a Norwegian FidoNet BBS, and others may soon read your line on San Bernardino BBS in Colton (Canada), Wonderland Board in Macau or the HighTech BBS in Sidney (Australia). SciLink (Canada) administers a network for distribution of conferences between systems using the Caucus software system. Participants in Tokyo, Toronto and San Francisco can discuss as if they were all logged on to the same online service. The main purpose may not be to make it simpler or cheaper for the user. One typical motive is to reduce an online service's own communications costs. KIDLINK is a global project for children between 10 - 15 years of age. It allows kids to discuss through a system of electronic mail. Part of the dialog takes place by the children sending email to a recipient called KIDCAFE. A message to 'the cafe' goes through the international networks to a host computer in North Dakota (U.S.A.). There, a computer program called LISTSERV distributes copies of the message to names on an electronic address list. (Conferences administered by a LISTSERV are called 'discussion lists'.) SciLink in Toronto is one recipient. Messages forwarded from North Dakota are made available for users as entries in a 'local' conference called KIDCAFE. A user in Tokyo can read a message, as if it had been entered locally. If she wants to reply, her answer is sent back to the LISTSERV for redistribution to the world. Western Michigan University (U.S.A.) is also a recipient. Here, another LISTSERV program is in charge of forwarding the mail to yet another list of (local) addresses. We call it a 'mail exploder'. This mailing list has been set up by local administrators to reduce costs. The individual user is not allowed to receive copies of messages all the way from North Dakota. One Michigan recipient may be a local area network. You will find many smart technical solutions in the online world. Actually, this is how the online world got started. Two systems were interconnected for exchange of electronic mail. Then, another system was added, and another. One day it was a global network of computer systems. Some network systems are connected by leased telephone lines. Other networks, like FidoNet, depend mainly on dial-up using regular voice-grade telephone service. Each BBS dial regularly to other computers in the network to send or receive mail and files. They may do it once per day, twice per day or whatever. Then someone got the idea of interconnecting networks. FidoNet was connected to the UUCP network, which was connected to the Internet, which in turn was connected to the Bergen By Byte BBS in Norway, CompuServe, SciLink, MCI Mail, and various local area networks. Today, the online world is a global web of networks. The world is 'cabled'. You, me and all the other modem users stand to benefit enormously.