Hello,
Managed client - You administer the clients from the console. Managed client computers connect to your network. You use the console to update the client software, security policies, and virus definitions on the managed client computers.
In most cases, you install the client software as a managed client.
You can install a managed client in either of the following ways:
Unmanaged client - The primary computer user must administer the client computer. An unmanaged client cannot be administered from the console. The primary computer user must update the client software, security policies, and virus definitions on the unmanaged client computer.
You install an unmanaged client directly from the product disc. You can also export an unmanaged client from the management console, with a group's policies or with the default policies.
See Exporting client installation packages.
See Installing an unmanaged client.
Check these Articles:
About managed and unmanaged clients
http://www.symantec.com/docs/HOWTO80767
Difference between a managed Symantec Endpoint Protection (SEP) Client and an Unmanaged SEP Client.
http://www.symantec.com/docs/TECH185894
Hope that helps!!