There is no Control manual last I heard.
There is no program swap feature. It would be nice. Maybe ET will consider this a feature request for e right click swap feature.
The equivalent of swap is possible already using right click copy and paste as follows. Right click on the destination program and select copy. Drag and drop the source program to the destination location. Right click the source program and select paste
I usually compose programs in a list called SCRATCH PAD. All kinds of garbage goes on there, like testing and comparing three variant programs I’m working on. When I finally have a best one, I copy and paste the best one into a real list. As SCRATCH PAD fills up with too much garbage, I’ll delete the whole list and create a fresh SCRATCH PAD.