Differences between US and EU version

[Arnulf]

What are the actual differences between theese two versions? What ties you to specific servers, is it the CD-key or is it coded into the client? Do the clients even take the CD-keys of the other version? That is, can one simply use the EU version, but enter a US CD-key and start playin on US servers?
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You probably think of the registration key here; the key you use to create an account on Blizzard's webpage. And yes, I believe it's coded into this key. Because you can use whatever client you want. U.S. Open Beta (patched of course), European UK/France/German client... whatever you want. If you've got an U.S. account you need to put in the login server into a file somewhere, but that's all there is to it.

Correct me if I'm wrong.

-Arnulf