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User
Interface Manager
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To
manage and display the user interfaces of other
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subsystems
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Calibration
User Interface
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An
interface for calibrating the wire-frame overlay
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Device
Drivers to Support I/O Devices
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Joystick,
HMD, Positioning and Orientation Devices
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Event
System
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To
interpret low level events and dispatch them to the
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appropriate
subsystems
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