Server 2003 with 20 clients - How many CAL's do I need?

I've never been quite clear on Microsoft CAL's.

I would like to implement a domain controller at a location that has 20 computers in a workgroup. The DC will only be authenticating the computers. No DHCP, fileserving, or anything else really.

To be compliant, how many CAL's do I need? In reality, will the DC know any difference how many CAL's I have? What are the considerations?
Ryman1Asked:
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rindiCommented:
You'll need 20 CAL's. The server's license manager will notify you if more PC's want to connect at any one time than the number of licenses that have been setup.
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Ryman1Author Commented:
So if I have a 5 cal license, it'll notify me when the 6th machine tries to login to the domain? Will it block the 6th host?

Do I need to enter additional licenses in the license manager because I don't recall having to do that?
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rindiCommented:
You won't be able to logon with the 6th PC if all the others are also logged on, and you'll see a message in the eventviewer.
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Ryman1Author Commented:
What about on the client machine, what error will I see when I try to join the Domain?
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rindiCommented:
I don't remember the message you'll get on the client. You'll probably just not be able to logon.
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Ryman1Author Commented:
I'm not convinced that you need that 6th CAL.

No one has recalled it specifically being a problem or receiving an error.
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rindiCommented:
The user won't be able to logon, and the server will have eventlog errors. Of course the problem only arises if all other licensees are already logged on at the same time. If you don't use all the clients at the same time then there is no problem.
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Computer101Commented:
Forced accept.

Computer101
EE Admin
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