How does Script stop itunes ical?

I have a 27" iMac with 3.2 GHz Intel Quad Core i5, 8 GB DDR3 RAM, 1 TB HDD and running on OSx Mountain Lion. I have iCal 4.0 that runs a script to my iTunes for the alarm. I can't seem to stop the script for the alarm. How does script stop iTunes iCal?
