There is an InContainer() UDF to determine OU.

Look for the file to indicate ePO is already installed:
\Documents and Settings\All Users\Application Data\Network Associates\Common Framework\LastPropsSentToServer.xml

Install with:
\\server\share\FramePkg.exe /install=agent /forceinstall
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.