- Universal Asynchronous Receiver/Transmitter. A module composed of a single
integrated circuit, which contains both the receiving and transmitting
circuits required for asynchronous serial communication.
- Universal naming convention.
- Universal modem driver. A driver-level component that uses modem
description files to control its interaction with the communications driver,
- Uninterruptible power supply. A device connected between a computer and a
power source that ensures that electrical flow to the computer is not
interrupted because of a blackout and, in most cases, protects the computer
against potentially damaging events such as power surges and brownouts.
- USB request block. Clients send URB transfers to the bus by including a
pointer in an IRP to a URB structure; a function within the URB identifies the
- Universal Serial Bus. A bidirectional, isochronous, dynamically attachable
serial interface for adding peripheral devices such as game controllers,
serial and parallel ports, and input devices on a single bus.
- USB class
- The class of filters under WDM that provides a bus interface and bus
enumerator for USB.
- User mode
- For Windows and Windows NT/Windows 2000, the nonprivileged processor
mode in which application code executes, including protected subsystem code in
Windows NT/Windows 2000.
- User-mode drivers
- Win32-based multimedia drivers and VDDs for MS-DOS–based applications with
application-dedicated devices. For more information, see the Multimedia
Drivers and Virtual DOS Drivers documentation in the
Windows 2000 DDK.