The taskbar button
RigReady's button on the Windows taskbar is more than a way to the window. Right-click it to launch a setup, read the state of the rig from its badge, and use the buttons under its thumbnail.
The badge, the progress bar and the thumbnail buttons have not yet been verified on real hardware: Windows accepted them in tests, but nobody has looked at them on a real taskbar. The changelog lists them under known limitations.
The Jump List
Right-click the button. The list has Launch <setup> for the setups used most recently, up to six, the most recent first; setups never used come last, by name. A setup that launches nothing is listed as Make ready: <setup>. Each entry runs the same command as a desktop shortcut: see Starting without the window.
The list follows your setups: one made, renamed, deleted or used changes it.
The badge
The button carries the state of the setup in use, in colour and in shape so it reads either way: a green dot for Ready, an amber triangle for Ready with warnings, a red square for Not ready. There is no badge until the checks have run. The same shapes are on the tray icon.
The tooltip
Rest the pointer on the button to read the same line the tray shows: the setup, its state, and what is not met by name, as far as fits.
The progress bar
The button fills while Make ready, Launch, Stand down or a single fix runs, whoever started it: the window, the tray, a shortcut. During Make ready and Launch it shows how many steps are done. During a check you asked for, it moves without a count. The quiet re-check of the Play screen does not show.
The thumbnail buttons
Rest the pointer on the button and three small buttons appear under the window's thumbnail: Make ready (a check mark), Launch (a triangle) and Stand down (a square), each with the setup's name in its tooltip. They do what the same lines of the tray menu do (Make ready and launch, Stand down), with the same limits: nobody can be asked, so fixes that need your OK are not run, and the game is never closed. They are greyed while RigReady is working, and Launch is greyed for a setup that launches nothing.