I see the A/C computer listed under the domain, but it also is still listed under the workgroup. I can click on either one and access the files without difficulty. If I click on one of the icons, it says domain and of I click on the other it says workgroup. This still occurs even after all computers have been rebooted. I assume that this should not be happening. If I go to the A/C computer and click on computer properties, it shows that it is now a member of the domain. I don't understand... Any thoughts?
One of the things that happens with Windows workgroup is that the peer machines elects a machine that maintains the workgroup participants. The domain controller, on the other hand, will always maintain the domain members.
So, for the time being, the old participant registration will continue until it ages off.