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(Q,R)

QWERTY: The QWERTY (pronounced KWEHR-tee) keyboard is the standard typewriter and computer keyboard in countries that use a Latin-based alphabet. QWERTY refers to the first six letters on the upper row of the keyboard. The key arrangement was devised by Christopher Latham Sholes whose "Type-Writer," as it was then called, was first mass-produced in 1874. Since that time, it has become what may be the most ubiquitous machine-user interface of all time.
The QWERTY arrangement was intended to reduce the jamming of typebars as they moved to strike ink on paper. Separating certain letters from each other on the keyboard reduced the amount of jamming. In 1932, August Dvorak developed what was intended to be a faster keyboard, putting the vowels and the five most common consonants in the middle row, with the idea that an alternating rhythm would be established between left and right hands. Although the Dvorak keyboard has many adherents, it has never overcome the culture of learning to type on a QWERTY.

RADIUS: RADIUS (Remote Authentication Dial-In User Service) is a client/server protocol and software that enables remote access servers to communicate with a central server to authenticate dial-in users and authorize their access to the requested system or service. RADIUS allows a company to maintain user profiles in a central database that all remote servers can share. It provides better security, allowing a company to set up a policy that can be applied at a single administered network point. Having a central service also means that it's easier to track usage for billing and for keeping network statistics. Created by Livingston (now owned by Lucent), RADIUS is a de facto industry standard used by Ascend and other network product companies and is a proposed IETF standard.

REGISTRY: 1) In the Microsoft Windows 95, Windows 98, and Windows NT operating systems, the Registry is a single place for keeping such information as what hardware is attached, what system options have been selected, how computer memory is set up, and what application programs are to be present when the operating system is started. The Registry is somewhat similar to and a replacement for the simpler INI (initialization) and configuration files used in earlier Windows systems. INI files are still supported, however, for compatibility with the 16-bit applications written for earlier systems.
In general, the user updates the Registry indirectly using Control Panel tools, such as Tweak UI. When you install or uninstall application programs, they also update the Registry. In a network environment, Registry information can be kept on a server so that system policies for individuals and workgroups can be managed centrally.
2) The Internet Registry manages the Internet's domain name system. It is supervised by the Internet Architecture Board of the Internet Society.

RENDERING: To render (a verb, pronounced REHN-dir, from the medieval French rendre meaning "to give back or yield") has a number of usages along the lines of forming something out of something else originally given. A jury renders a verdict given evidence and the rules of law. Animal fat can be rendered into lard. Out of loyalty to the king, a service is rendered. An artist can render an idea in the mind into a drawing on paper. A translator renders one language into another.
In computer graphics technology, computer software can be used to render special 3-D effects given the right programming statements. A computer display system renders an image that is sent to it in the form of a bitmap or streaming image.
A rendering (noun) is a term sometimes used to describe a drawing, sketch, plan, or other artistic or engineered effort to depict or portray something on paper or in another medium.

ROTFL: Abbreviation of roll on the floor laughing, commonly used online or on IRC.

ROUTER: On the Internet, a router is a device or, in some cases, software in a computer, that determines the next network point to which a packet should be forwarded toward its destination. The router is connected to at least two networks and decides which way to send each information packet based on its current understanding of the state of the networks it is connected to. A router is located at any juncture of networks or gateway, including each Internet point-of-presence. A router is often included as part of a network switch.
A router creates or maintains a table of the available routes and their conditions and uses this information along with distance and cost algorithms to determine the best route for a given packet. Typically, a packet may travel through a number of network points with routers before arriving at its destination. An edge router is a router that interfaces with an asynchronous transfer mode (ATM) network. A brouter is a network bridge combined with a router.

RTS: Request To Send.