Thank you for your response, however...
I may not have been as clear in my original post as I could have been - but the problem I am addressing is that of Altiris registry keys left behind on client systems, not on the Symantec (Altiris) Management Console Server.
My question/issue is: When the Management Console is used to push out an installation of the Altiris Agent, BESR Plug-In, and BESR 2010 there are a pile (well over one hundred) of Altiris registry entries that are created on each client machine. When I decided I wanted to revert all my clients to unmanaged systems (standalone BESR 2010) I uninstalled the Altiris Agent from each client using the Management Console - basically I pushed out an Uninstall. This did in fact uninstall the Altiris Agent, but it left behind many Altiris registry keys in each client. So, as a second measure I tried the following procedure found elsewhere on this forum to clean the client registries;