Torpark description from official web site states:

Download Torpark for your language, and put it on a USB Flash keychain. Plug it into any internet terminal whether at home, school, or public. Run Torpark.exe and it will launch a Tor circuit connection, which creates an encrypted tunnel from your computer indirectly to a Tor exit computer, giving the appearance of having the Tor exit computer’s IP.

Torpark is designed to work in a USB key. So it may be used on any public computer to browse the web safely. Torpark includes Tor and Firefox.