hai

i hava got a project for developing vpn in java for a company which is making
parts of TVS SUSUKI.
this company has many clients and some sister concerns.
i dont know much about vpn. so tell me how to begin this project? what sort
of data should i collect from the company
and how to implement this in java.
Can any give me the necessary details regarding this.
Or please tell me the sources from were i can get information regarding this
project.

THIS IS VERY URGENT!! SO PLEASE HELP AS SOON AS POSSIBLE.