Increasingly, computer users are using different folders, drives, and even different computers (such as a laptop and a desktop) to store and retrieve files. There are new sources of files coming from every direction: digital cameras, e-mail, cell phones, portable media players, camcorders, PDAs, and laptops. Yet managing hundreds or thousands of files is still largely a manual operation. In some cases it is necessary to move files from one place to another; in other cases there is a need to keep two storage locations exactly in sync. Some users manage files manually, dragging and dropping from one place to another and keeping a mental card catalog in their heads. Others use one or more applications of one sort or another to provide this functionality for them.
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