svn:externals and specific revisions

I like svn:externals. I have a question, and I don't see the answer
anywhere in my googling, so I'm posing the question here. I know that
when I use this property I can make changes to the external files and
commit them when I'm at the HEAD. What is the behavior when I specify a
revision? Does it stop all commits? If not, why not? I can see where
all kinds of havoc can be wreaked if users started updating an external
pegged at an older revision.
 
 

--
David Bicking
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