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Portable Digital Assistants (PDAs) are adopting touchscreen technology to make it easier to operate the device. These have become immensely popular. A touchscreen detects a touch within its display area. The touch may be that of a finger or hand directly or through an intermediary as a stylus. This makes the touchscreen as an interface to interact with the device through the touchscreen. The interaction is with what is indicated or displayed at the point of touch. It is a substitute of what otherwise was managed directly by a mouse or a touchpad. Touchscreen actually does not even need an intermediary as a stylus. The origin of touchscreen was in the 1960s and in 1972 it was used in a computer assisted learning terminal. The HP-150 was one of the earliest commercial touchscreen computer launched in 1983. Multipoint touchscreen has since been developed to facilitate touch by more than one finger on the screen. It is now possible for multiple users to interact with the touchscreen at the same time.