RFID & Tracmor integration

I'm wondering if anyone has managed a system with RFID?

I'm looking to implement a tracking system with RFID.  Basically, you would have an entry point to a room with two antennas.  If the reader reads a label from A to B, the system knows that the device is entering a room and should be checked in.  If the reader reads a label from B to A, the system knows that the device is leaving a room and should be checked out.

Ideally, it would be integrated with a badge swipe as well since our doors are only opened with a badge read.

Has anyone ever implemented a system along these lines?