U
- unbound command
- A command that does not have a key combination assigned to it. See bound command.
- UNC
- See Universal Naming Convention.
- unicast
- A communication between a single sender and a single receiver on a network.
- Unicode
- A 16-bit character set capable of encoding almost all known characters and used as a worldwide character-encoding standard. Windows CE uses Unicode exclusively at the system level.
- Uniform Resource Identifier (URI)
- See Uniform Resource Locator.
- Uniform Resource Locator (URL)
- The address of a resource on the Internet. URL syntax is in the form protocol://host/localinfo, where protocol specifies the means of returning the object, such as Hypertext Transfer Protocol (HTTP) or File Transfer Protocol (FTP). Host specifies the remote location where the object resides, and localinfo is a string—often a file name—passed to the protocol handler at the remote location. Also called Uniform Resource Identifier (URI).
- Unimodem
- 1. The universal modem driver, provided with Windows CE, that translates Telephony Service Provider Interface (TSPI) calls into AT commands, and sends the commands to a virtual device driver that talks to the modem. 2. A universal modem that supports standard modem AT commands. Windows CE currently supports only PCMCIA modems.
- universally unique identifier (UUID)
- A 128-bit value that uniquely identifies objects such as OLE servers, interfaces, manager entry-point vectors, and client objects. Universally unique identifiers are used in cross-process communication, such as remote procedure calling (RPC) and OLE. Also called globally unique identifier (GUID).
- Universal Naming Convention (UNC)
- The system of naming files among computers on a network so that a file on a given computer will have the same path when it is accessed from any of the other computers on the network. For example, if the directory c:\path1\path2\...pathn on computer server is shared under the name pathdirs, a user on another computer would open \\servern\pathdirs\filename.ext to access the file c:\path1\path2\...pathn\filename.ext on server. See also Uniform Resource Locator.
- universal serial bus (USB)
- A serial bus with a bandwidth of 1.5 megabits per second (Mbps) for connecting peripherals to a microcomputer. USB can connect up to 127 peripherals, such as external CD-ROM drives, printers, modems, mouse devices, and keyboards, to the system through a single, general-purpose port. This is accomplished by daisy-chaining peripherals together. USB supports hot plugging and multiple data streams. Developed by Intel, USB competes with DEC's ACCESS.bus for lower-speed applications.
- up-down control
- A control containing a pair of arrow buttons that a user can click to increment or decrement a value, such as a scroll position. When used with an edit control or other type of companion control, an up-down control is referred to as a spin button. See spin button control.
- URI
- See Uniform Resource Locator.
- URL
- See Uniform Resource Locator.
- USB
- See universal serial bus.
- USB driver
- A device driver for USB-compatible devices.
- user-initiated update
- An operating system image update mechanism, provided by the dial-up boot loader, that is designed to be used by users and field technicians. The operating system image is downloaded using a modem connection. See also automatic update, factory update.
- user level driver
- See stream interface device driver.
- user notification
- A warning to the user that a timer event has occurred. The notification may require the user to perform some action to handle the notification or may generate a sound to alert a user. For example, the system may display a dialog box and play a sound or display an icon before a scheduled appointment. The user would tap the dialog box OK button to acknowledge the appointment. User notifications are always associated with an application.
- UUID
- See universally unique identifier.