Actually, it does work. you just open the activity and copy the activity link into iframe or you open the specific thread you want them to read/post to and link that. It will show the whole page (which includes course title and the nav portal thing) because that's how the activities work when you open them but it doesn't have to be the course page. And I'm positive about this because I just did it.
But I will add, as I said before, iframes are not typically recommended. Just possible.
But I will add, as I said before, iframes are not typically recommended. Just possible.