The toolbar is the central control for gTuring. It provides you with four buttons for operating the machine. Each button gets activated or deactivated depending on the execution status of the machine, showing you your options at the moment.
Reset: Sets the machine at state 0 and puts the tape's contents as it was originaly entered by the user. The machine's head is set at the leftmost character of the tape.
Stop: Pauses the machine.
Run: The machine starts transitioning from one state to the next, according to the states that have been previously loaded in it. The speed at which the transitions are executed is set in the "Options" menu.
Step: Execute only one transition.