Probleam with dialing user name and password

Question

I have a new private broadband connection . As i have three computer my problem is that i have to turn on to one of my computer which is a SERVER to connect to the internet connection for dialing the user name and password from it .So can i dial the user name and password from my router so that i can access the internet without turning on the SERVER computer for that purpose . As it is very inconvenient for me to turn on the SERVER every time .