Typical methods of entering text on touchscreen PDAs include:
* A virtual keyboard, where a keyboard is shown on the touchscreen. Text is entered by tapping the on-screen keyboard with a finger or stylus.
* An external keyboard connected via USB, Infrared, or Bluetooth. Some users may choose a chorded keyboard for one-handed use.
* Handwriting recognition, where letters or words are written on the touchscreen, and the PDA converts the input to text. Recognition and computation of handwritten horizontal and vertical formulas, such as "1 + 2 =", may also be a feature.
* Stroke recognition allows the user to make a predefined set of strokes on the touchscreen, sometimes in a special input area, representing the various characters to be input. The strokes are often simplified character shapes, making them easier for the device to recognize. One widely-known stroke recognition system is Palm's Graffiti).
Despite rigorous research and development projects, end-users experience mixed results with handwriting recognition systems. Some find it frustrating and inaccurate, while others are satisfied with the quality of the recognition.
Touchscreen PDAs intended for business use, such as the BlackBerry and Palm Treo, usually also full keyboards and scroll wheels or thumbwheels to facilitate data entry and navigation.
Many touchscreen PDAs support some form of external keyboard as well. Specialized folding keyboards, which offer a full-sized keyboard but collapse into a compact size for transport, are available for many models. External keyboards may attach to the PDA directly, using a cable, or may use wireless technology such as infrared or Bluetooth to connect to the PDA.
Newer PDAs, such as the Apple iPhone, Apple iPod Touch, HTC HD2, and Palm Pre, Palm Pre Plus, Palm Pixi, Palm Pixi Plus, include more advanced forms of touchscreen that can register multiple touches simultaneously. These "multi-touch" displays allow for more sophisticated interfaces using various gestures entered with one or more fingers.
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