Lads be careful. If you fill in an on-line form the recipient can read your IP address. If you say something naughty they might be able to trace you, and if you ever decide to email them a real job application in future (booo!) they'll possibly be able to connect you with the logged IP.
If you want to surf the net with anonymity I suggest you go here;
http://www.anonymizer.com/ no need to download anything, just type the page you want to visit into the window at top left on that site and away you go.
Good luck.