BleepingComputer.com: Just a question about security in user/admin accounts

Do the security programs updated and maintained separately? For instance, if I update, run, or use immunize feature in Spybot S &D in the admin. account, does that extend to the regular accounts as well? What about the opposite?If I use admin privileges in a user account to do the same, does that extend to other accounts as well or is it contained withing that account?

Unless otherwise specified when installed (some programs), It will update for all users

Thanks, Sir.