The Free On-line Dictionary of Computing (30 December 2018):

Remote Access Services

    (RAS) A service provided by Windows NT
   which allows most of the services which would be 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.

   [What services?]

   (1996-08-14)