How to check out only differences between two revisions

I've a private home page, which is under CVS now.
When making changes - and tagging old and new version - how can I
check out only those files, which have changed since the old revision?

I'd like to get only those files, which I have to copy to the internet
for updateing my online-version.

The cvs diff command lists me all differences (every line). This in
not what I need.
Trying checkout merge didn't bring sucess so far - may be I made it wrong.




 
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