cvs issue about sync checkout/checkin between two modules.

Marco <[email protected]>
Newsgroups gmane.comp.version-control.cvs.general
Organization http://groups.google.com
Message-ID <8b42c2b5-b98b-404d-961c-1d976fe34380@c36g2000prc.googlegroups.com> 
Hi all
Can someone give me some advices how to do below ruquest?

Two modules: A and B
one file: f
f exists in A and B.

upgrade f, check in to A or B not (A and B).
whenever check out A or B, the f is synced most current one.

Thanks a lot!

Marco.P
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