For cues, Ardour generally follows the design pattern of other applications that support a grid-based non-linear workflow. Here are themain elements of the Cue window.
Grid: tracks and cues. FIXME
Slot: launch indicator, title, follow action indicator. FIXME
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Similarly to the ordinary track, this is where you assign a virtual instrument to a MIDI track and/or add effects to be applied to all clips in a track regardless of what scene they belong to.
Again, similarly to ordinary tracks, this is where you tweak the fader and panner positions, mute or solo an entire track.
Ardour defaults to displaying the Clips tab as the clips browser is commonly used for pulling reusable clips into the project.
You can also access the list of tracks, which in the context of the Cue window is mostly useful to mark a track as visible or not visible in the Cue window.
Additionally, you can pick a source or a region in the Sources or Regions tabs respectively and drop them in the Clips tab to copy a reusable item to your custom library of clips.
The bottom bar contains three or four groups of controls depending on the type of a clip, audio or MIDI.