An ultra-mobile PC (ultra-mobile personal computer or UMPC) is a miniature version of a pen computer, a class of laptop whose specifications were launched by Microsoft and Intel in spring 2006. Sony had already made a first attempt in this direction in 2004 with its Vaio U series, which was however only sold in Asia. UMPCs are generally smaller than subnotebooks, have a TFT display measuring (diagonally) about 12. 7 to 17. 8 cm (5 to 7 inch screen), are operated like tablet PCs using a touchscreen or a stylus, and can also have a physical keyboard. There is no clear boundary between subnotebooks and ultra-mobile PCs, but UMPCs commonly have form factors other than the common clamshell laptop design, such as having small keys on either side of the screen, or having a slide-out keyboard.
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