No, CALs don't work that way. You will need to setup a Licensing Server and such, plug in the CALs, and everything else works transparently. Login, AD, all of it is the same. It's transparent. There's a bit to it if you've never worked with it before, so I'll refer you to some MS literature to get you started:
http://www.microsoft.com/windowsserv.../overview.mspx
http://www.microsoft.com/windowsserv...loverview.mspx
http://support.microsoft.com/kb/325869
There are two kinds of Client Access Licenses:
Per User CALs and
Per Device CALs. To quote
MS KB823313:
•
TS Device CAL: A TS Device CAL permits one device (that is used by any user) to conduct Windows sessions on any of your terminal servers.
•
TS User CAL: A TS User CAL permits one user (who uses any device) to conduct Windows sessions on any of your terminal servers.
This means a CAL is assigned to either a machine (Device CAL) or to a user (User CAL). All of this is handled through the licensing server. To get a firm grasp on the subject, read the above excerpt carefully. Remember this is
licensing - the only thing it affects is whether or not a user or machine can use/be used for Terminal Services.