Run Backward
    The Run Backward option is provided both under the Simulator menu as well as on the toolbar as a button with
a left arrow and a bar.  This command will run backwards through the currently loaded assembly program until
either an error is encountered or the beginning of the program or a breakpoint is reached.  When complete, all
registers will show their most current values.  This command CANNOT be run until a file is loaded into the simulator
(using Open or one of the recently opened files).