This article is from the FAQ, by with numerous contributions by others.
If you're limited to a Unix shell account, you may still be able to take
advantage of Winsock applications. Several SLIP Emulators are available
which "convert" standard shell accounts into makeshift SLIP accounts.
Note: Many providers do not allow you to run a SLIP emulator. Some are
concerned about system resources; others want you to buy a real
SLIP or PPP account (which are almost universally more expensive).
If your provider bans use of SLIP emulators, using one may result
in loss of your Internet access. (Yes, system administrators can
tell if you're using a SLIP emulator even if you change the
executable's file name or size.)