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Reference.org
Handheld PC
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<p>A handheld computer, also called a palmtop computer, is a term that has variously been used to describe a small-sized <a href="/facts/Personal_computer/koaYfNce">personal computer</a> (PC) typically built around a <a href="/facts/Clamshell_design/pCR2wwHQ">clamshell</a> form factor and a <a href="/facts/Laptop/3EFwTAb2">laptop</a>-like <a href="/facts/Computer_keyboard/MczF9LIS">keyboard</a>, including: <a href="/facts/Palmtop_PC/c28NGHpt">Palmtop PCs</a>, <a href="/facts/Personal_digital_assistants/fLTT1Uqy">personal digital assistants</a> (PDA), <a href="/facts/Ultra-mobile_PC/uh0bzTeU">ultra-mobile PCs</a> (UMPC) or portable <a href="/facts/Gaming_computer/Yc77JAke">gaming PCs</a>. The brand Handheld PC specifically is a now-defunct class of computers introduced in the 1990s that was marketed by <a href="/facts/Microsoft/nGIDDXdx">Microsoft</a>, and is detailed below. </p>