Dial-Up Networking uses Session Management Modules to abstract the interface presented by the dial-up server. This allows new modules and drivers to be "plugged in" as necessary to support new servers.
Window 95 has built-in support for 4 session management modules: PPP, RAS, Netware Connect and SLIP.
Windows 95 Session Management Modules can also "overlay" other session management modules. This allows features such as scripting or security to be added to the product.