This is really a page to talk about how to measure the actual angle that a servo has reached, rather than the last position the servo was told to move to. The aim is to be able to allow the servos to automatically configure their actual max/min angles. In addition, it should allow for quicker response to the stop() method.
The stop() method stops the sweeper that is currently running for the servo. However, this only tells it to stop the sweeper, the servo will continue to move to the last position it was told to go to.