Working a job: read the order and its limits, place each device in a room, lay the cables between their ports, set each device up, then Check the job. Open a device from the floor plan, the logical diagram or the buttons above the terminal.
Cables: choose a device and a port for each end. A run between two rooms is as long as the house makes it, and you see the length before you lay it. To move a device, pull its cables out first. Undo takes back your last change.
How help works: Mason helps with the first line of the order that isn't met. The first and second checks that still fail it, nothing; the third, where to look; the fourth, the principle that decides it; the fifth and every one after, he narrows it to two, with a reason for each thing he rules out. He never says what to type or where to plug.
Commands on the computers (Command Prompt tab):
Your progress is saved in this browser: each job, and your notes.