A handtop is a full-featured portable computer that is slightly larger than a PDA, but much smaller than a laptop. Sometimes called an ultrapersonal computer, a handtop offers hardware, software, performance, and display capabilities similar to those of a laptop in a form factor about the size of a paperback book. Vendors propose that people could use the small portables not only as PDA and laptop replacements but as desktop replacements as well.
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Handtops are especially well suited for travelers or mobile workers because they provide a good compromise in terms of functionality and portability. Unlike a PDA, a handtop can run the same operating system as a desktop computer and can display Web content without modification. Most handtops have a small keyboard; many also have a touch screen and docking station. Products on the market or in development include the OQO, the Tiqit, Vulcan's FlipStart, and Sony's U50/U70.