Multiple Step Backward
    The Multiple Step Backward option is provided both under the Simulator menu as well as on the toolbar as a
button with two left arrows.  This command will prompt the user for the number of steps desired, then use this
number to step backward through the currently loaded assembly program.  If a breakpoint or error is encountered,
program execution will stop regardless of how many steps have been executed.  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).