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U
universal group
A security or distribution group that can contain users, groups, and computers from any domain in its forest as members.Universal security groups can be granted rights and permissions on resources in any domain in the forest.
Universal Naming Convention (UNC)
A convention for naming files and other resources beginning with two backslashes (\), indicating that the resource exists on a network computer. UNC names conform to the \\servername\sharename syntax, where servername is the server's name and sharename is the name of the shared resource. The UNC name of a directory or file can also include the directory path after the share name, by using the following syntax: \\servername\sharename\directory\filename.
universal serial bus (USB)
An external bus that supports Plug and Play installation. Using USB, you can connect and disconnect devices without shutting down or restarting your computer. You can use a single USB port to connect up to 127 peripheral devices, including speakers, telephones, CD-ROM drives, joysticks, tape drives, keyboards, scanners, and cameras. A USB port is usually located on the back of your computer near the serial port or parallel port.
upgrade
When referring to software, to update existing program files, folders, and registry entries to a more recent version. Upgrading, unlike performing a new installation, leaves existing settings and files in place.
