This is a 'Web 2.0' Ajax PHP/MySQL desktop website that uses the extjs code library (www.extjs.com)

Several great contributions were made by Todd Murdock (mxracer), including the TaskBar and StartMenu UX components. More information can be found in this thread on the ext js forums:

http://extjs.com/forum/showthread.php?t=10950

Demo here:

http://www.jsDesk.com