A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z

U

UDP - Unified Datagram Protocol
URI - Uniform Resource Identifier: URIs are used to address resources in the Internet. They are devided in two different systems, URL and URN. HTML uses URIs to link hypertext documents to other resources.
URL - Uniform Resource Locator: URL is a URI format used to address resources in the Internet. The format is:
protocol://server:port/path/filename
URN - Uniform Resource Name: This URI format will make it possible to locate *any* resource (text, image, sound...) in the Internet by a *unique* name. The idea is to get the file no matter on which server it is located.
Currently this format is just an idea without a specific definition.
US-ASCII - United States ASCII: This is the recommended name for ASCII.

A - B - C - D - E - F - G - H - I - J - K - L - M - N - O - P - Q - R - S - T - U - V - W - X - Y - Z