I also worked for a Uni in 2005 that actively deployed access control at dorms that was based on the dorm canteen food ordering system, running on dos. By doin

I also worked for a Uni in 2005 that actively deployed access control at dorms that was based on the dorm canteen food ordering system, running on dos. By doing so they only have to capture the students details once, and students used the same card to access the dorm, or to order food. The downside was the cost of the hardware, which was only avail from the vendor. I believe it still runs today. If it ain't broken, don't fix it?