Remote Access Services (RAS) refers to any combination of hardware and software to enable the remote access to tools or information that typically reside on a network of IT devices.

Originally coined by Microsoft when referring to their built-in NT remote access tools, RAS is a service provided by Windows NT which allows most of the services available on a network to be accessed over a modem link. The service includes support for dialup and logon, and then presents the same network interface as the normal network drivers (albeit slightly slower). It is not necessary to run Windows NT on the client - there are client versions for other Windows operating systems.

To use RAS from a remote node, you need a RAS client program that is built into most versions of Windows, or any PPP client software. For example, most remote control programs work with RAS.

Over the years, many vendors have provided both hardware and software solutions to gain remote access to various types of networked information.

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