With Reset, you can reset the simulated PLC (and the simulator). This corresponds to a cold start of the PLC (the connection between Control Expert, the simulator is broken, project variables are reset and the simulator goes in RUN (if auto start is activated) or in STOP (if auto start is deactivated)).
Reset corresponds to the reset button on a real CPU.
You can execute reset with
NOTE: %S0 is not set to 1 using Reset with the PLC simulator (in contrast to a real PLC).