Information on Purging Resources from CMS

I had a couple of quick questions about how purging maintenance works:

1.) Is there a table which records the clients which have been retired (we retire, and dont delete)? I dont have Asset Management Installed on this box, and I do know how to check the asset's status.

2.) If the device comes back online, will the NS automatically reconnect with the agent and change the status back to active?

Thanks for your time.