Many early PDAs were not primarily focused on virtual keyboards. The four main approaches to enter text into a PDA were: virtual keyboards operated by a stylus, external USB keyboards, handwritten keyboards, and stroke recognition.
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Virtual keyboards are also used as features of emulation software for systems that have fewer buttons than a computer keyboard would have. Text is commonly inputted either by tapping a virtual keyboard or finger-tracing. Virtual keyboards are commonly used as an on-screen input method in devices with no physical keyboard, where there is no room for one, such as a pocket computer, personal digital assistant (PDA), tablet computer or touchscreen-equipped mobile phone. Multitouch screens allow the possibility to create virtual chorded keyboards for tablet computers, touchscreens, touchpads and wired gloves. On the Internet, various JavaScript virtual keyboards have been created, allowing users to type their own languages on foreign keyboards, particularly in Internet cafes.