
TYPO3 is a web application programmed in PHP, but it is not an application in the usual sense, such as desktop applications for Windows, Linux or Mac. In other words, TYPO3 is installed on a webserver alongside PHP, and you use it with a web browser, such as Internet Explorer or Firefox. You "run" TYPO3 on the server itself.
To run TYPO3 successfully, there are some requirements for both server and client (user) that must be met.
High-performance setups will want to take advantage of load-balancing and using the staging/static HTML-export capabilities of TYPO3. To get started, check for the static file setup in the mailing list archives and in the installation script.
Optional - but recommended - web server software extras:
Individual extensions may require additional software to be isntalled. For instance, the AWstats extension is based on Perl and the Indexed Search engine uses "pdftotext" and "catdoc" for indexing PDF and Word documents.