A client of ours asked about how the licensing of ArcGIS Engine works. We wrote a “classic” MapObjects application years ago for them, but they want to take it to the next level. I started to explain how it works (yes I’ve finally figured out the licensing), but then remembered a video that Brian Goldin and Rob Elkins did a couple months ago that does a very good job of explaining it. If you still have trouble understanding how ArcGIS Engine works you might want to watch the video.
I know Brian has been busy, but hopefully there will be more videos from ESRI soon.