There are three main ways of accessing ActiveControl.
1. ActiveControl Windows GUI
2. ActiveControl Web UI
3. SAP GUI
The ActiveControl Windows GUI is where most of the configuration of the tool is done, and also offers some the more Basis-type functions (eg manual imports of transports) that are not available in the Web UI. Other than that, the Web UI offers most of the core functionality of ActiveControl such as Approvals, Testing, Reporting etc.
Developers and Functional teams and Approvers/Testers will typically utilise a combination of the SAPGUI and the ActiveControl Web UI to perform their roles within ActiveControl.
Change & Release Managers, Basis and ActiveControl Administrators will typically utilise the ActiveControl Windows GUI.