Getting the revisions numbers of head revisions in main trunk

[Sherman Tse]

Hi all

I an trying to do an rdiff between one of my branchs and the head revisions 
in the main trunck.

As far as I know, the cvs is only capable to do riffs of both 
releases/branchs are identified by tags.  The problem is that the head 
revisions in main are not tagged so cvs cannot do an rdiff in this case.

If cvs is really not capable of doing this, could you tell me what I can do 
to accomplish the same thing?

Thanks.

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