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.

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