EFF demonstrates a browser's "finger print"
The Electronic Frontier Foundation (EFF) citizens' rights organisation has launched an online service that allows internet users to find out how unique their browser is. This is predominantly interesting for internet users who are worried about their privacy and identifiability on the net – apart from cookies, session ID or IP address, a browser's finger print can potentially identify its user with considerable accuracy.
It is not uncommon that the test conclusively identifies a browser – especially if a user surfs the net with a non-mainstream browser on a non-Windows system. However, users don't necessarily have to use Internet Explorer 7 on Windows XP and a medium-size monitor to avoid leaving conclusive finger prints.