The inner working on Nina , EACH square has the info that makes up this type of photography. Below is a very fast overview of the imaging tab the blue circle far left edge of photo. screen is roughly 9 boxes

1. Top left is information about the camera Running at -10
2. below that is data from the Focuser position , 17.3C outside.
3. Next box down data about the mount and its position in the sky.
4. Middle box is the stacked photo made up of 143 photos .
5. to the right of the middle box you can see the focus curve and its data.
6. Below that you can see the target position in the sky relative to sunset left and sunrise to go with that there is a dotted line that show where the mount is on the night journey.
7. Top Right is the manual box for taking a photo manually.
8. The box below is the sequence steps the blue square is the stop button to stop the sequence manually.
9. The graph below that is the PHD-2 Guiding graph.

At the very bottom you can see a green box that is the shot time of the camera in this case 65% of a 2 min shot.

Also on the bottom flashes up the stacking steps what is happening to that photo till it get to the stack. The photo shows the edges of each photo as its stacked as its is put in place the green line around is the data that will be lost from the movement of dithering each photo. you always have to crop a small amount each side of the shot to get a clean edge and not show stacking artefacts.