[Exim] system filter using procmail?

Hello folks...

Is there anyone using procmail for filtering all the incoming messages
instead of using exim's builtin system message filter facility?

I actually searched through the web site but only found that
the built-in exim system filter and procmail can be used simultaneously
but no details. (http://www.exim.org/FAQ.html#TOC302)

I am using debian GNU/Linux woody with exim 3.35.

Any comment will be greatly appreciated.

Thanks very much...
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