How to go back to the branch after mistakenly switching to the trunk

[Ming Kin Lai]

I did not read carefully the documentation on "cvs commit -r REV" and made a 
mistake by committing a revision with a specified REV number on a branch.  
One cannot commit to a specific revision on a branch - and I did exactly 
that and now that revision is on the trunk.  Specifically, I made a tag on 
the trunk (let's say at revision 1.1) called "Root-of-Branch" before 
creating a branch called MyBranch using "cvs tag -b MyBranch".  Then I made 
some changes and tried to call it 2.1 by using "cvs commit -r 2.1".  Well, 
this 2.1 is now on the trunck, not on the branch.  My question is:  How can 
I go back on the branch so that my next revision is on the branch?
(Preferably, someone would tell me how to "move" that 2.1 to the branch?)  
Thank you.

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