USB keys are a popular method for storing files and documents; they are small, hold a reasonable amount of data and are very easy to use. We use them to save documents and work on them at home, at work or on the move. However, when you work on the same document across multiple machines, it's difficult to keep track of the most recently saved files. Keeping your documents up-to-date across all machines is crucial to prevent confusion. 19 Jun 2008