Beginner's Guide

Figure 1: Table with
all installed extensions
In this area you can enable, disable and uninstall extensions. Enabling and disabling works just like a
light switch. You simply switch the extension on and off, all the related data are still kept. If you unistall
an extension, it will be deleted. Often extensions, usually components, create additional database tables
while installing. It's up to the component de-installation routines, whether these tables will be deleted or
not during de-installation. Check the manual or readme file in advance to avoid suprises.
The last icon in the toolbar is the cache icon. Every extension is able to cache data. You can clear this
cache separately for every extension. If your Joomla site attracts lots of visitors and you don't want to
clear the whole cache for performance reasons, you may need this function.
If you filter the list for libraries, you will find these four articles with the corresponding version
number:
•
Joomla Application Famework, which is the real 'core' of the Joomla CMS. All the other extensions are
built upon this framework.
•
PHPMailer
57
is a class, written in PHP for sending emails. This is used in the mail to component.
•
SimplePie
58
is a class, written in PHP for managing RSS ans Atom feeds. This is used in the newsfeeds
component.
Joomla! 2.5 - Beginner’s Guide
Monday, 30 January 2012! Page 148
57
http://phpmailer.worxware.com
58
http://simplepie.org/