RFID for Laptop Inventory Tracking?

An anonymous reader asks: "We are in the process of getting new laptops and I was wondering if anyone has used RFID for inventory control of them? Like many places laptops have had a way of going MIA. In an ideal world I would like to be able to get a 'real time' update of where the tags are located. I also would like to know when a RFID tag goes by a fixed location such as a door. What are people's experience both good and bad with RFID? Is this realistic? Where do I start? Had this been done with open-source?"