viewing branch info for non current working copy

[Ronald Petty]

I was wondering is there a way to see what other versions there are for
a file in the repository.

My problem is the following.  I have a certain revision checked out,
however I would like to do a diff on another version (which I do not
know the number or name).  So without looking in the actual repository
and finding the names/version numbers is there any other way to do this?

Thanks
Ron