to observe the behaviour or communications of individuals or groups (see surveillance)
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A computer display, monitor or screen is a computer peripheral device capable of showing still or moving images generated by a computer and processed by a graphics card.
Colour monitors may show either digital colour (each of the red, green and blue signals may be either on or off, giving eight possible colours: fl, white, red, green, blue, cyan, magenta and yellow) or analog colour (red, green and blue signals are continuously variable allowing the display of any combination).
Digital monitors are sometimes known as TTL because the voltages on the red, green and blue inputs are compatible with TTL logic chips.
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