Can you explain what the purpose of hotspots is?
You can set up hotspots on your screen so if you have a dock hiding off screen when not in use, you move your cursor to the edge of the screen (corner's or middle) and the dock pops up. You can even have the dock on the left of the screen, but the hotspot on the right. It's pretty handy. The dock is available if you want it, even when a screen is maximized.
I don't think hotspots can be used with the freeware version of OD though, only the Plus version.