Ah, that makes sense to me. I hadn't thought about the multiple people access problem since I've never needed more than one set of guest keys at a time, and th

Ah, that makes sense to me. I hadn't thought about the multiple people access problem since I've never needed more than one set of guest keys at a time, and the offices I've worked in were all big enough to use keycards. Come to think of it, the market for 'Needs to give multiple people rotating revocable access' is a great fit for AirBnB type services.