The entire collection of hardware is called a display and is managed as a single unit,
intended to be used by one person. It is possible to have multiple displays connected
to one computer, but a separate X server needs to be run for each display.
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12 Chapter 1: Introduction to the X Window System
Pointing Devices
Pointing devices fall into two general categories: relative and absolute:
Relative pointing devices
These send only movement information to the display. A new pointer position is
calculated by taking the previous pointer position and updating it with the indicated
movement. Mice, trackpads, and trackballs fall into this category.
Absolute pointing devices
These send an exact screen position to the display. Touchscreens, graphics tablets,
and light pens are all absolute devices.
It is possible to have multiple pointing devices connected to one display. This is common
on laptops; some have two built-in pointing devices, and some users add a traditional
mouse to compliment a built-in pointing device. The devices act in parallel,
and any can be used to move the pointer on the screen (Section 4.8).
A display is rarely configured without a pointing device, but this may be done for an
information-only display that does not permit user interaction.
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