Each element has its own animation queue, so if you have multiple Turtles or Sprites, they will normally animate simultaneously without regard for each other.
To synchronize the motion of multiple elements, use sync.
a = new Turtle red
b = turtle
c = new Turtle green
for [1..20]
(random [a,b,c]).fd 20
(random [a,b,c]).rt 88
sync a, b, c
a.dot red, 100
b.dot green, 100
c.dot blue, 100
sync can synchronize any number of elements or
arrays of elements. All the listed elements will
insert a pause into their animation queue, and wait
for all the other elements to reach the same point.
Once all elements have caught up, all the elements
resume animating.
To synchronize an element with the main turtle,
use the special varible turtle to represent
the main turtle.