I use my iPhone with Keynote Remote app to control my Keynote presentation on my Mac so I can roam the space and see my notes. However, yesterday the wireless connection was almost non-existent. So I could not use my iPhone, and therefore, could not see my notes easily!
This morning I remembered that I can set up an ad hoc connection! So the plan today is to use the ad hoc until I need to go to the internet.