1. So, hypothetically, I live permanently in Turkey. My brother, an international drugs and arms dealer and all-round naughty boy, regularly stays with me. I don't need to inform the authorities that he's a guest ?
2. I'm sure that I read somewhere that it's illegal for a hotel to retain your passport. They're perfectly entitled to examine it and record the details, but you are the only person, except for law officers, who is allowed to be in possession of it. In fact the passport belongs to the "issuing authority" and you are its keeper and should take good care of it on their behalf.