RAS Multiple User Connection Solution

Dear Sir,

I have a WAN that Contain two LAN in different area, As I know in NT 4.0 I can give permition to my User connect to the server by RAS and they give permition to do their job as same as in their office, when they login to the system, I have 20 users that have to connect simultanusly to my WAN I have to know, Is Ras service of NT permit to shairing connection on Modem if not do you know any software that do it.??????

Thanks and Best Regards.

Ron Farzan