Thanks Gents. I've recently come back to DW and have been working on a mission but had come across what I thought was a bug. It appears not after having read this particular thread.
My mission involves a NATO contingent taking on a Russian contingent off coast of Norway. With respect to the NATO contingent, I have three separate sides. US SAG, UK SAG and a French SAG. When I had opened up the "show link" command, nothing showed up but the US SAG side which is the playable side. I then thought I must have to hit the "show allies" command in order to see allies on "the link."
When you do this, you see everthing then, including subs down under in the deep obviously out of communication depth. I thought, "damn, this is a significant bug! Why can't I get those "allies" on the link?"

:hmm:
Now I know. As I read this thread, I am to understand that the only way the player can get any friendlies "on the link" is if they are on the same side as set in the mission editor. The "show allies" command in the nav menu section is actually a cheat. So, if I want to have everyone on the link, forget the "alliance settings" and put everyone on the same side in the mission editor. Am I thinking about this the correct way now?