It was a separate product, which was hard to find. They builded it in into DXL 5.0.

In the DXL 5.0 Release Notes they mentioned it as:

Advances in automation
Remote commands that are exposed in McAfee ePO or Security Innovation Alliance Partner products can be
called directly over DXL. Invoking remote commands over DXL is useful with automation tasks, whether they are
user-driven (orchestrated), or performed without user involvement (automated). For example, DXL can generate
a McAfee ePO Threat Event, or a DXL event on any topic via an Automatic Response Action.

Vadim