System software are software that can be installed and run separately
A combination circuit would be needed for security because if you had a strait circuit if any one of those sensors or the keypad was ripped off the circuit will now let the flow of electricity be possible but with a combination circuit it helps eliminate that problem because even if on flow path is cut off, other paths are still available <span />
Some devices that depend on gravity to function include scales, showers, and satellites, to list a few.
Character command shows the status.
