Layer 8
In computer networking, there is a descriptive system called the OSI Seven Layer Model that explains and prescribes the way data packets travel through a network system, and the protocols involved.
Layer 1 is the Physical layer that describes the actual wiring, etc. (Is it plugged in?)
Layer 7 sets out the way applications interact with users. (Is “SuperGame” capable of sending a message to Facebook?)
If you are having a problem with a computer, is the computer really to blame? Or is it a layer 8 issue? (Think about it.)
The usual problem is one of fingers not being attached to the brain. We all do it, and the biggest boo-boo is to add a space to the beginning or end of stuff we type in; I do it all the time.