x.. tog index display to show/not show this ``INTERRUPT KEY INDEX``.
f.. tog end pause (off) or (on) to pause/not pause at the foot of the screen.
#.. tog scrolling (off) (the hash key) to toggle scrolling 1d space-time patterns.
+.. tog time-step pause (the plus key) to itterate one time-step at a time.
q.. pause or quit to pause and see further options (#26.3), or backtrack.