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Special Forums UNIX Desktop Questions & Answers What are the 7 layers of OSI model or TCP/IP Post 17937 by Perderabo on Thursday 21st of March 2002 09:57:48 AM
Old 03-21-2002
First, please see my post in this thread.

Quote:
Originally posted by Neo
Here is another question:

With N-tier web application services and publish-subscribe architectures in the picture, what are the current layered protocol stack (complexity management) models?
Stuff like this does not modify the basic networking protocols. Rather, it imposes much more order on the application layer. The three tier model, which my company now uses, says that the user should not need a special client for your application. Instead, the user should just use a local web browser. Next, the user should not be expected to learn sql or anything like it to search a database. Some kind of easy to use middleware should interupt the user's needs and figure out what to do. That front-end to our database is complex and multi-layered itself. But we still call the whole concept a three tiered approach.

In the old days, we would have delivered special client software to our customers with its own user interface. And some skill would be needed to search our database. Now our customers just use a web browser and this alone shortens the learning curve. And you could probably teach Lassie to search our database...no sql or anything.

But the whole shebang is running on TCP/IP which has not changed. I don't know what publish-subscribe means, but I doubt that it modified TCP/IP either.
 

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WWWBrowser(3pm) 					User Contributed Perl Documentation					   WWWBrowser(3pm)

NAME
WWWBrowser - platform independent means to start a WWW browser SYNOPSIS
use WWWBrowser; WWWBrowser::start_browser($url, -oldwindow => 1); DESCRIPTION
start_browser($url [, %args]) Start a web browser with the specified URL. The process is started in background. The following optional parameters are recognized: -oldwindow => $bool Normally, the URL is loaded into a new window, if possible. With "-oldwindow" set to a false window, "WWWBrowser" will try to re-use a browser window. -browser => $browser Use (preferebly) the named browser $browser. See "CONFIGURATION" for a some browser specialities. This option will only work for unix. CONFIGURATION
For unix, the global variable @WWWBrowser::unix_browsers can be set to a list of preferred web browsers. The following browsers are handled specially: lynx, w3m Text oriented browsers, which are opened in an "xterm", "kvt" or "gnome-terminal" (if running under X11). If not running under X11, then no background process is started. kfmclient Use "openURL" method of kfm. netscape Use "-remote" option to re-use a running netscape process, if possible. _default_gnome Look into the "~/.gnome/Gnome" configuration file for the right browser. _default_kde NYI. The following variables can be defined globally in the main package: $os Short name of operating system ("win", "mac" or "unix"). &status_messages Error handling function (instead of default "warn"). REQUIREMENTS
For Windows, the Win32Util module should be installed in the path. AUTHOR
Slaven Rezic <slaven@rezic.de> COPYRIGHT
Copyright (c) 1999,2000,2001,2003 Slaven Rezic. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself. SEE ALSO
Win32Util. perl v5.10.0 2009-03-10 WWWBrowser(3pm)
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