The Operations Manager team have released a command line tool similar to the GUI tool within the MOM 2005 reskit for Operations Manager 2007. Check out the details and download here http://blogs.technet.com/momteam/archive/2007/11/20/remote-agent-prerequisite
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Read the complete post at http://blogs.technet.com/cliveeastwood/archive/2007/11/20/remote-agent-prereq-check-tool-for-opsmgr07.aspx