Maybe a timeout period or ask the user if everything went right or confirm save calibration settings. The utility program needs to provide an clean, friendly exit should things go wrong.
The utility plays no active part in the calibration process, but can be used to find out why it is failing.
The "sensor view" is especially useful.
The cause of this is the sensor cant see the LED bar when the gun is pointed at the bottom of the screen.
This is caused by:
Too close to screen
Board not mounted horizontally in gun (this is the most common reason)
Leds not angled downwards
Something obstructing the sensor, eg edge of gun nose
LED board failure (check by looking with a digital camera)
(very rare) double-sided tape used to secure the IR filter on the front of the sensor off-center and partially blocking sensor lens.
Dirt on sensor.