There is a such a wide array of switch types to choose from, it is almost impossible to think of an individual who couldn't be matched with a switch if necessary. Many of the pointing devices you have already looked at are essentially switches. Switches may be:

• Single function: this is the basic unit that is like a toggle switch: you click to make a selection, and often one click will turn on, the next click off.
• Dual function: this type of switch is basically a combination of two single switches, and allows you to hit one part of the switch for one function, another for a different function. Sip and puff controllers are dual function switches.
• Multi-switches: these switches put a number of single switch functions together. If several toys were connected to a multi-switch, for example, a different switch might activate each toy. On a computer game, the different switched might have different functional uses in controlling the program.