Look
At

This function
allows you to make an object, camera, or light force itself to remain pointed
at another object.
Using:
- First select the object
you want to look at the other object.
- Click on the look at
button(Tools/Object Tools) or on the top Tool Bar.
- Click on the object
you want to look At.
The first object will instantly align itself with the other object and will
remain looking at the other object even when either of them have moved