Will unified installer use already provided software

Is the Plone unified installer, when rectifying software requirements, aware
of system-provided software, or does it assume that the installer- provided
software will be used regardless?  As an example, if the system already had
ElementTree installed (rhel5, python elementtree 1.2.6-5.i386), would the
Plone installer use its ElementTree rather than that already present?

Also, how can I find out what versions of a pre-req (ElementTree or other)
Plone3.0 has been tested with?

Thanks for any assistance.

Sincerely,
Glen Browning
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