Is it possible that my perl script (Apache::Registry, Apache::PerlRun, 
HTML::Mason or whatever) could run multiple times with same parameters when the
user just invokes the URL once (for example clicks on <A> tag)  and if so how 
can I prevent this from happening.

I guess this is because of subrequests being fired and I _explicitly_ don't 
wish my code to run multiple times because strange things might happen.

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