Using the vex library, how do I use the limit switch block to control the position of a servo motor?, To stop a motor controlled by the joystick from running a certain direction?

Using the vex library, how do I use the limit switch block to control the position of a servo motor?, To stop a motor controlled by the joystick from running a certain direction?

The students want to use a limit switch for two purposes on their robot. One is to make sure motors controlled by the joystick are turned off before moving certain robot parts too far. The second is set a servo motor to a certain position when the limit switch is hit.