Windows

if u have a modem to connect the win2k server in ras connection, try this

1. make a connection -when ever ur trying a connection it will show the all option of dial up connection select ras in wizard and connect same way vpn also(in wizard u have to select the vpn connection and give the ipaddres of the server)in ras u have to give the telephone number where the server is connected. i hope this will solve ur problem

HOW TO: Install and Configure a Virtual Private Network Server (Q30820
This Microsoft Knowledge Base will help you configure and answer your questions.
As to WHY additional configuration on the workstation??
Remote Access and Virtual Private Networks are by defination a means of accessing a remote network (through a server) for resources. This is also a means of protecting and securing a network and resources on that network. This gives one the ability to properly configured clients and servers that use this some degree of privacy depending on how strong of encription is used.
There are several white papers and Microsoft sites that give detailed information on the "how to"!! I hope I answered the why for you. OK Thank You.