The only system requirement for the CPL is a web browser utilizing an up-to-date Java plug-in (currently this means version 1.4.2 or better).
If you do not have an up-to-date version of the plug-in, it can be obtained at Sun's Java download page.
For Macintosh users, it should be noted that the only browser that meets the Java plug-in requirement at present is Safari.
In order to view the tutorial movies on this site, you will need an up-to-date version of Flash Player, which can be obtained from Macromedia's Flash Player download page.