You can also access the simulation controls on the Simulation tab using keyboard shortcuts:
The step sizes are dependent on your selection from the Simulation tab > Simulation Controls > Increment menu. The keyboard shortcuts are:
Space — Plays the simulation to the end.
Ctrl + Space — Plays the simulation to the end of the current item.
— Advance one point through the simulation.
+Ctrl — Advance five points through the simulation.
+Ctrl+Shift — Advance fifty steps through the simulation.
+Shift — Advance one tenth of a point through the simulation.
— Reverse one point through the simulation.
+Ctrl — Reverse five points through the simulation.
+Ctrl+Shift — Reverse fifty steps through the simulation.
+Shift — Reverse one tenth of a point through the simulation.
Shift + Page Up — Advance to the next component.
Shift + Page Down — Reverse to the last component.
Page Up — Advance to the next NC item or connection.
Page Down — Reverse to the previous NC item or connection.
End — Moves the tool to the end of the toolpath.
Home — Moves the tool to the start of the toolpath.