windows server licensing modes

licensing mode on windows server 2003?
What are to two differences between:
- Per server. Number of concurrent connections (box to put a number in) Each connection must have its own client access lisence
Describe in simple terms please,
Thanks
- Per device or per user. Each device or user must have its own client access lisence
sigh, yahoo answers muddled up the question. the text with - are the options. 'describe in simple terms' and 'thanks' are ment to be at the bottom.
What that means is that you have to purchase an EULA (End User License Agreement) for each work station that uses the same copy of a particular program.
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MSVolUseRights #123 Microsoft Licensing Product Use Rights