A turtle can find out the name of the turtle that it is
touching by using touchedturtle in an
instruction in its OnTouching field in the Rules Tab of its
backpack. The information touchedturtle
reports makes it possible for the turtle to react
differently when touching different turtles.
Examples of valid OnTouching instructions:
ask touchedturtle [note 65 5]
if touchedturtle = "t1 [glide 200 2]
remove touchedturtle
ask touchedturtle [ht]