Serial Line Internet Protocol (SLIP), is an older communications standard found in UNIX environments. SLIP does not provide the automatic negotiation of network configuration and encrypted authentication that PPP can provide. SLIP requires user intervention. Windows NT 3.5 RAS can be configured as a SLIP client, enabling Windows NT users to dial into an existing SLIP server. RAS does not provide a SLIP server in Windows NT Server.
See the RASPHONE.HLP online Help file on the Windows NT distribution disks (or, if RAS has been installed, \systemroot\SYSTEM32) for more information about RAS.