Dear, All

I'm in the process of writing a code for a web-site. The idea is that it has
to be modular in its features.
By saying that I mean, that there is a storage of data and I wish to run a
report against this data, all I have to 
do is copy a script and hook it up to the main code like a plug-in (think of
it like adding a plug-in in a Photoshop).
The question that I'm trying to answer is - how to implement this "plug-in
mechanism" in perl? 
What about performance (when some snippet of code has to be ran via "shell"
of "exec" every time a variable is passed)?

Thank you in advance!
Roman


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