SLIP/PPP are the protocols most often used to connect computers to their Internet gateways using dial up phone lines. Modern PC OSes usually support SLIP, PPP and the underlying IP protocol. Internet service providers will typically provide a package that handles the specifics of connecting to their service without involving the user. PC applications and destination sites operate in terms of Internet Protocol (IP) without worrying about how the IP Packets get to/from the Internet. Users of nuts and bolts level OSes like MSDOS and Linux may have to worry about details of the protocols when configuring their systems.
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