Command button 
...this button calls up the dialog Configure driver command. In this dialog, click on 
Select command and select the required command. Depending on the type of command you may have to enter further parameters. Usually, the driver author will have written a few words of explanation which are displayed in the dialog box. If no commands are selectable, you need to choose a driver first. See Using drivers for serial control.
Action button 
...sends the selected command via the associated port to the device. To be able to do so, the device ports need to be enabled. See also Synchronizing devices.
Override button 
...disables timeline output and allows the device in question to be controlled via the control panel field only. When override control is disabled, it still allows control via the control panel field, but commands in the timeline are sent all the same.
Grouping of control panel fields ...allows joint operation of devices. Highlight the corresponding control panel fields, right-click one of these fields and select Grouping 
Create new group. Grouping functions, in principle, correspond to objects. See Grouping objects. For one-off joint operation of devices, highlighting the corresponding control panel fields will also do.
You can have the devices, triggers, etc. which are linked up with the control panel fields displayed in the Media Pool by clicking the control panel field and selecting