"Clickers" are audience response systems that we use in classes.  More general information about them is here. 

SAS Computing now offers Audience Response Systems, which we call “Clickers”, for use in classes.

Students use small handsets (pictured to the left) to vote on multiple-choice surveys or quizzes that are projected on the screen by the classroom computer or the instructor's laptop. Software on the computer collects the responses and displays a histogram of the results when voting has finished. The instructor can choose to indicate which was the correct answer, or can withhold this information to promote discussion. All of this is easily set up by the instructor using free software from TurningPoint.

Introduction

• What are clickers/audience response systems?
  Audience response systems (which we call "clickers") include 3 components;