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Macs may be able to turn a wall or any surface into a touch input device in the future, with Apple researching ways to add touch-based interactions to a surface that doesn t have any capability for touch sensing at all. A compact projector in use. Many electronic devices offer touch capabilities as a way to interact with the computer system, such as an iPhone or iPad display. While touch interfaces are common, there are areas where such interactions could be useful, but are currently not able to be used. For example, a teacher in a classroom may use a projector on a wall to show content to students. It is currently possible for the teacher to tap virtual buttons or interact with content displayed via the projector, but either by interacting with the host computer directly or by employing a potentially expensive smartboard system that can detect touch. ....