The “1” is important here, so be sure to include it in your command for opening the UI and/or for the shelf button you might want to create. The following window should appear, initially with empty lists, of course.
Click an item on the image to jump to its description.
The drop-down list on the bottom left of the window contains all objects that have a setup for the animUI. Any node in Maya can be added to the list by simply selecting it in the scene and choosing Add Selected Object from this list.
Each node that has such a setup can have a different configuration and control any number of attributes, have different sections and presets. The UI will show the configuration of the object that is selected in this drop-down list.
The Select button simply selects the currently chosen object.
Pressing the Key All button will set a keyframe for all attributes of the currently displayed setup.