User input is the means by which a user communicates with a Microsoft® Windows® CE–based device. The OEM determines the specific combination of input devices that are supported by your platform. Different platforms support different input devices. For example, some platforms, such as the Palm-size PC, support a touch screen rather than a keyboard for text entry. Other platforms might include handwriting recognition software in place of or in addition to a keyboard. The Windows CE operating system (OS) supports the following types of user input: