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Zach Koerbel ’16 and Jeremy Cohen ’16 couldn’t get into the precept they preferred for a computer science course. “I would check the registrar’s site a dozen times a day to see if a spot had opened up,” Koerbel said. So they wrote a program that alerted them when a space became available — and now any student can use it by visiting the student-run ­TigerApps website.

Using the free Web application, named Princeton Pounce, students ­registered to receive an email or text ­notification when slots in 50 courses and precepts became ­available.