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A live CD Linux distribution can offer a full-fledged computing environment on a CD or DVD, but if you have access to a Windows-based machine, a removable storage device with Windows portable applications might be a better option. Luckily, using a Windows machine doesn't mean you can't use open source software. Many of the most popular portable applications are, in fact, open source: applications like OpenOffice.org, Thunderbird, Firefox, and Gaim. Let's take a look at some of the lesser-known and most useful portable applications you can put on your USB flash drive or mobile hard disk