Branching and merging
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CVS allows you to isolate changes onto a separate line of
development, known as a "branch". When you change files on a branch,
those changes do not appear on the main trunk or other branches.
Later you can move changes from one branch to another branch (or the
main trunk) by "merging". Merging involves first running `cvs update
-j', to merge the changes into the working directory. You can then
commit that revision, and thus effectively copy the changes onto
another branch.