(Note: Javascript is required to use the PhEDEx Web Application. The following description is intended for web-crawlers).
PhEDEx is the data transfer system used by the CMS experiment at CERN.
The PhEDEx Web Application requires a browser with javascript available and enabled. We recommend the latest version of Mozilla Firefox, available here.
If it is not possible for you to use a browser with javascript, you can write scripts to use the data service directly. Data service documentation is found here.