Linux portable applications run from removable media like USB drives, CD or similar without installation. Just imagine you copy pidgin IM client to USB flash drive and can use it on any Linux distribution including Ubuntu, Fedora, Mandriva whatever: no need to find pidgin package for specific distribution, no need to install it as binary .deb or .rpm or compile it from sources (yes, I know people who still compile pidgin from tag.gz sources), no need to gain root rights for installation. Just download one of Linux portable apps, copy it to USB and run it anywhere!

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