I should add that the sim I worked in was not MS Flight Sim nor was it one of the sims operated by the company advertising for staff.
The program controlling the "aircraft" functions was a commercial program that had been written for a training sim and it accurately reflected the flight characteristics of a B738, especially the inertia which caught out a lot of GA pilots who thought they knew it all. About 90% of the functions were connected and operational and it was possible to do a "flight" from start-up to shut-down. From the instructors station it was possible to induce any number of system and engine failures.
The sim was also connected into the internet which made it very interesting when taking part in multi-player exercises as the vision system would show the other players and display the appropriate returns on the TCAS display. It was good fun, even if not real.