I'm using Vista, and need to temporarily (1 day a week at a client) logon to another windows domain (my laptop is on the work domain, and I don't want to have to put the machine permanently on the client's domain). 

I need to actually logon to the domain, because I need to use windows authentication for things like SQL Server, I know that you can put in the username/pass for file shares.

I have a login for the domain, and admin rights on my machine.

Is this possible?