An Action List is an ordered collection of Action Command structures. It is the executable content of a Command object. Each element of the list (accessed by array index) represents one complete sequence that the Command object can perform when it is triggered at that index.

The Command object type was designed to let a single object act as a programmable "macro" or "batch" controller. By writing different values to the Present_Value property (or by using Write Property to individual array elements of the Action property), a client can select which pre-defined sequence of operations should be executed. This is heavily used in life-safety, chiller plant optimization, lighting scenes, and any situation where a coordinated set of actions must be performed atomically from the viewpoint of the operator.

Because the list can contain dozens of individual Action Commands and each command can target a different object and property, the encoding of an Action List is one of the more complex constructed data types in the protocol.