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In general, these systems consist of a school photo ID card affixed to a lanyard that is worn around the student's neck. The ID has a RFID chip embedded in it. The tag includes a digit number assigned to each student. As a student enters the school or pass beneath a doorway equipped with an RFID reader, the tag ID is read, recorded and sent to a server in the school's administrative office. The captured data not only provides an attendance list (sent to the teacher's PDA), but tracks the student's movement throughout the day.

I like that it makes attendance easier to monitor but still seems kinda creepy...and there's always a way around those systems....