I'm sure somebody will come in and explain it better (and in better english too), but before it happens...
A few years ago, I had connected IC-7200, afedri SDR, HDSDR and CW Skimmer. Everything was controlled by Omnirig. You could click on HDSDR or Skimmer waterfall, or dial frequency on IC-7200 and every other thing followed it. Unfortunately, I don't remember exact step by step instructions, but thanks to Omnirig (the same author as CW Skimmer) it was quite simple to make it work.