Many of our posts are authored and edited by multiple people. It seems like even if someone is working on a post, someone else can still access and edit that post; there's no checkin/checkout protections (is that correct?) We've thus had some problems with people unwittingly working on a post simultaneously and overwriting each other's work. Is there a way to prevent this from happening? I saw this hint about setting a password when editing, but I wasn't sure what that means or how to do it. Does anyone know of a checkin/checkout plugin?