Nematron Pointe Controller - Manual (Page 188)

Chapter 6: Downloading to the Controller Pointe Controller User Guide
186
6.2.1 Detaching from a controller
When PCM is attached to a specific Pointe Controller unit, it disables the
Controller drop-down menu to prevent you from accidentally disrupting
communications with the controller. You must explicitly detach from the
currently attached controller before you can select another.
To detach from a controller, click the Detach button to the right of the
Controller drop-down menu. You can then select and attach another controller
as described above.
NOTE: If a project is running on an attached controller, it will continue to run
after you detach from it.