U

UNC

See universal naming convention.

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 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 Universal Resource Locator, 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.

universal naming convention (UNC)

The system of naming files among computers on a local area network so that a file has the same path name when accessed from any of the computers on the network. For example, if the directory c: on computer servern is shared under the name pathdirs, a user on another computer would open \servern.ext to access the file c:.ext on servern.

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).

up-down control

See spin button.

URL

See Uniform Resource Locator.

user level driver

See installable 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 the user. For example, the system may display a dialog box and play a sound or 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.