Imagine a different way of computer life. For 80% of your computer-using time, you carry a usb key as your notebook computer You come to a foreign place and are allowed to use an unfamiliar computer. The computer may work perfectly or it may have been rendered non-bootable by a virus. It may be a powerful one or it may be an inexpensive netbook. It may speak Zulu or Tamil. In any case, you insert your usb key, and in a few minutes you are surfing the net to finish an article that you began writing yesterday on a different computer, while having a chat with your friend in [insert your language here]. When you shutdown the computer and remove your usb key, the computer returned to its original state without any trace of disturbance.