RAM: Random access memory; a computer component that allows you to store data.

RDRAM: Direct Rambus RAM; a branded random access memory that allows your computer to store data. Rambus memory modules are much faster than the standard DDR modules, but are being replaced by DDR2 modules.

ReadyBoost: A technology that allows your computer to augment its memory using a flash memory drive.

ReadyDrive: ReadyDrive takes advantage of “hybrid” hard drives — the drives with significant amounts of integrated flash memory — to boot faster.

reboot: To restart your computer.

recharging cradle: A base connected to a power outlet into which you can place a device that runs on rechargeable batteries in order to recharge those batteries.

.reg file: A file that contains a backup of Windows Registry entries.

Registry Editor: A Windows tool that allows you to manually make modifications to the Windows Registry.

Remote Assistance: A Windows tool that you can use to allow a user on another computer to access your computer so that they can help you correct errors.

resolution: The number of pixels that your monitor’s display can show, both horizontally and vertically.

resource: Something that a computer uses to get work done, such as memory or processor power.

Resource Monitor : Windows tool for keeping track of the way all your system's components are being used, focusing primarily on the RAM and processor.

ROM: Read-only memory; Permanent memory that can’t be altered by the microprocessor.

root keys : Entries in the Windows Registry.

router: A sophisticated device used to connect your network; it can manage hundreds of networked computers and handle Internet traffic.

RSI: Repetitive stress injury; a physical condition caused by putting too much strain on a joint of the body.

RSS feeds: Really Simple Syndication feeds: Automatically updated content that can be viewed with an RSS feed reader.