Modern autopilots use computer software to control the aircraft. The software reads the aircraft's current position, and then controls a Flight Control System to guide the aircraft. Boeing 737 autopilots incorporate thrust control capabilities that can control throttles to optimize the airspeed with lower fuel consumption than a human pilot.
Audio Control Panel, VHF Radio, Nav Radio and Marker Beacons are only a smoll part of many feature that you can control in 737 Boeing Simulator.
A flight management system (FMS) is a fundamental component of a modern airliner's avionics. An FMS is a specialized computer system that automates a wide variety of in-flight tasks, reducing the workload on the flight crew to the point that modern civilian aircraft no longer carry flight engineers or navigators. A primary function is in-flight management of the flight plan. Using various sensors (such as GPS and INS often backed up by radionavigation) to determine the aircraft's position, the FMS can guide the aircraft along the flight plan.
The overhead panel is the nerve center of the aircraft systems and replaces many of the controls previously located on the flight engineers panel.