Mosaic with serial connection.

Ellis Golub ellis at biochem.dental.upenn.edu
Tue Dec 13 15:46:14 EST 1994

|> A dial-up connection will be a 'serial' connection, therefore, you 
|> run the system as 'virtual terminal' user. The real effect is that your
|> computer in Milano does nothing else than 'believing' it were a terminal, 
|> without any intelligence other than the purpose of viewing and looking 
|> at data. It does not matter whether you use public domain Mosaic or any 
|> of the commercialized (and occasionally better performing) products, 
|> as both do either speak WWW (i.e. your computer must use the WWW tongue, not 
|> the serial line tongue) or X-windows (i.e. your computer must be able to 
|> display a window generated remotely, in your case, in Bari). 
|> Your option were primarily to run LYNX, which is a textmode browser. 
|> Use this to query http://marketplace.com and read the article on the 
|> (commercial product) TIA. 
|> Option                  Protocol used          Client          Server 
|> ---------------------+-------------------+---------------+--------------
|> Mosaic, Others       | WWW on top of IP  |   PC/Mac      | any on the 
|>                      |                   |  LOCAL C.     | internet 
|> +--------------------+ MUST BE ON INTERNET---------------+-------------
|> X-Windows            | X-Windoes on top  |  remote system| any on internet
|>                      | of IP, must con-  |    \ -------WWW----->
|>                      | nect first        |  remote system| your local PC 
|>                      |                   |       \------------> 
|> +-------------------------------------------------------------------------
|> LYNX                 | serial; local to  | remote system | any on internet
|> +--------------------| remote connection |               |
|> TIA  (via telnet)    |                   |
|>                      | client is local   |

This is not completely accurate.  I am answering this post using an X-windows
interface via a serial line.  The software is exceed/express which is a serial
line extension to Hummingbird's exceed X-windows system (for Windows).  This also
requires an Internet connected host which can run host software. In this case,
the host is an SGI Challenge S server.  The initial connection is to a modem
pool connected to our university network.  The terminal server to which one
connects first allows telnet connection to the SGI host (or any other
host on campus). One then initiates the X-windows session by starting the
host software.  Aside from the slower speed, the PC acts like a proper X-terminal.

An alternate scheme, which has just begun here at Penn, is something called
PPP protocol.  This also allows pseudo network connection via a serial line,
and allows telnet, ftp, mosaic and netscape operations from a PC via a serial
connection.  This also works quite well, but is significantly slower than
a real Internet connection.

Hope this helps


Ellis Golub                            Phone: (215) 898-4629
Biochemistry Department                FAX:   (215) 898-3695
University of Pennsylvania             ellis at biochem.dental.upenn.edu
School of Dental Medicine             
4001 Spruce Street
Philadelphia, PA 19104-6003

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