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A touchscreen is a monitor where the screen can detect the presence and location of touch on the display area by finger pressure. Some touch screen devices can also sense passive objects like a stylus. Connectivity for the visual part of the monitor is via the usual interfaces such as VGA, DVI or HDMI depending on the specification. The touchscreen connectivity is via serial or a USB connection to the computer system. The computers operating system has to support touch screen functionality in order for the touch to screen to work.