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UMTS (Universal Mobile Telecommunications System)
broadband, packet-based transmission of text, digitized voice, video, and multimedia at data rates up to and possibly higher than 2 megabits per second, offering a set of services to mobile computer and phone users no matter where they are located in the world.

Unduplicated audience
the number of unique individuals exposed to a specified domain, page or ad in a specified time period.

Unique user
unique individual or browser which has either accessed a site (see unique visitor) or which has been served unique content and/or ads such as e-mail, newsletters, interstitials and pop-under ads. Unique users can be identified by user registration or cookies. Reported unique users should filter out robots. See iab.net for ad campaign measurement guidelines.

Unique visitor
a unique user who accesses a Web site within a specific time period. See unique user.

total population of audience being measured.

Unresolved IP addresses
IP addresses that do not identify their 1st or 2nd level domain. Unresolved IP addresses should be aggregated and reported as such. See also domain.

to send data from a computer to a network. An example of uploading data is sending e-mail.

URL (Uniform Resource Locator)
the unique identifying address of any particular page on the Web. It contains all the information required to locate a resource, including its protocol (usually HTTP), server domain name (or IP address), file path (directory and name) and format (usually HTML or CGI).

URL tagging
the process of embedding unique identifiers into URLs contained in HTML content. These identifiers are recognized by Web servers on subsequent browser requests. Identifying visitors through information in the URLs should also allow for an acceptable calculation of visits, if caching is avoided.

Internet bulletin-board application.

an individual with access to the World Wide Web.

User agent string
a field in the server log file which identifies the specific browser software and computer operating system making the request.

User centric measurement
Web audience measurement based on the behavior of a sample of Web users.

User registration
information contributed by an individual which usually includes characteristics such as the person's age, gender, zip code and often much more. A site’s registration system is usually based on an ID code or password to allow the site to determine the number of unique visitors and to track a visitor's behavior within that site.


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