Best practices in maintaining a computers inventory

Hello All,

I want to ask you (in your experience) what are the best practices trying to maintain my computers's inventory. When you take out a computer from your network do you delete it from the console (CMDB)?

• If you do that, how do you track this an all the historical computers?
• If yo don't delete it, how do you release the licences used by this computer (Symantec Management Agent, PCAnywhere, etc)?
• How do you prevent that all historical computers (the ones that are not in the network) shows in the console, and in all the reports.

Can you please give me some advices of what you use to do administrating this inventory or some KB in Symantec?

Thanks in advance.

Luis.