List of ITMS services ( Altiris Services )
If you open the Services console ( services.msc ) on your Altiris/ITMS server, you will find the All Altiris services (Usually Altiris services start with the name "Altiris****" ). If you open the Properties of those services you will find the description of them.
For Symantec Management Agent you will see below service :
Please note: There will be more services if you have roles added on the server like , Package server, Monitor Server, NBS server .