When logging on to a corporate network from a remote location, you're usually required to authenticate against the Windows domain.
For years that's been accomplished by using 2000 or XP's "Logon via Dialup connection" checkbox at startup.
But it's not there in Vista, so what do you do?
Don't worry as the process is similar; it's just not obvious. The setting is located in the Control Panel's "Network and Sharing Center". The secret is to select the "Allow other people to use this connection" option, allowing Windows to display the connection prior to a user login.
Next time you logoff you will see a blue icon to the lower right of the screen, select this option to "dial up at logon"