Look at all those User Guides and Service Manuals. There's more than two for the projector, there are two for the media player and the theater management system. There is a sophisticated router and firewall with manuals, and the satellite system has the physical and the electronic hardware plus the computer system that receives the data.
For all those who have already memorized these, you can skip this course. Not that we are going to go through how to push the Load and Play buttons for each system. But manuals presume enough basics, and have enough similarities. Our objective is to cover those basics here so that they make more sense as you go through the engineers idea of what you should know.
As you have figured out by now, it is being ready and effective wheen the unexpected happens that is the goal here.