U:

Universal Asynchronous Receiver/Transmitter. Common name for the hardware that drives an RS232 serial port.

See also: RS232  

A framework for creating user interface controls; a framework for applications to handle user interface events; and environment utilities for control creation and access to windowing functionality.

A component that provides user interface resources for a particular messaging protocol.

The central user interface class. It creates and owns controls to display the application data, and centralises handling of command input from standard controls such as menus and toolbars. The app UI base class is provided by CEikAppUi, which can be customised by using the resource structure EIK_APP_INFO.

A UID, or "Unique Identifier", is a globally unique 32-bit number used in a compound identifier to uniquely identify an object, file type, etc. When users refer to "UID" they often mean UID3, the identifier for a particular program.

See also: UID type  UID1  UID2  UID3  compound identifier  

A set of three UIDs which, in combination, identify a Symbian OS object; encapsulated by a TUidType.

See also: UID1  UID2  UID3  

The first UID in a compound identifier (UID type). It identifies the general type of a Symbian OS object and can be thought of as a system level identifier; for example executables, DLLs, and file stores are all distinguished by UID1.

See also: UID  UID type  UID2  UID3  

The second UID in a compound identifier (UID type). It; distinguishes within a type (i.e. within a UID1), and can be thought of as an interface identifier. For example static interface (shared library) and polymorphic interface (application or plug-in framework) DLLs are distinguished by UID2.

See also: UID  UID type  UID1  UID3  

The third UID in a compound identifier (UID type). It identifies a particular subtype and can be thought of as a project identifier (for example UID3 might be shared by all objects belonging to a given program, including library DLLs if any, framework DLLs, and all documents).

See also: UID  UID type  UID1  UID2  

ISO 10646-1 defines a "universal character code" which uses either 2 or 4 bytes to represent characters from a large character set. Thus, Far Eastern character sets can be represented. In Symbian OS, 2-byte UNICODE support is built deep into the system.

In the context of an agenda entry, thus uniquely identifies an agenda entry or to-do list in an agenda file. This value is assigned when the entry or to-do list is created, and is preserved during updates. Because of this, it can be used to identify the entry or to-do list during synchronisation.

See also: entry ID  

A piece of hardware on which a device may be found.

The system time, equivalent to GMT.

See also: home time  

The offset in seconds from the universal time.

See also: universal time  

Untimed alarms are associated with untimed agenda entries. The alarm time is independent of the time of the entry with which it is associated.

See also: Timed alarm  clock alarm  orphan alarm  snoozed alarm  session alarm  

Window Server : An event of type Button1Up, Button2Up or Button3Up. The user actions that result in these events will vary depending on the type of pointing device: mouse, pen, etc.

Uniform Resource Locator, an address of a resource on the World Wide Web.

The layer of controls, editors and dialogs which allows a user to control a running application. In Symbian OS, user commands are handled by a subclass of CEikAppUi.

See also: application  command  

A component that provides user interface functions for a particular messaging protocol.

Universal Time Co-ordinated. The UTC offset is the same as the GMT offset.

Utility classes provide easy access for applications to frequently-used functionality. Notable files are EikFileUtils for file access, and EikResourceUtils for resource access.

A Universally Unique Identifier, a unique 128-bit number. UUIDs are used for Bluetooth device addresses.