So there is a slight difference, Altiris is no longer recommended for managing the agent. There is the DLP Integrated Component for Altiris that can be installed on the Symnatec Management Platform and then has tasks prebuilt for deploying the DLP endpoint agent. There are also some other prebuilt tasks (like restart the agent, stop the agent, etc) that can be run
Symantec in 12.0 mentions the correct way now to manage (change the endpoint agent, etc.) the agent is through the DLP Console.
You can still deploy the agent trhough Altiris and in fact is a very easy way to do if you have Altiris in your environment.