Do you have to show them I'd or license?

No, you don't. Car dealers send different drivers through all the time, so there's no need to show personal ID, just car registration.

So I can get new tags for someone and renew?

Just registration and proof of insurance on the automobile

Nope.

No I did not

Just the paper work

I didnt

You have to show that you have car insurance. You fill in all the information on the paperwork they send you. Then you hand the paper to the guy before he tells you what line to get into. He will also scan the number inside the front door jam.

You show them the car registration and state issued request for fulfilling your tabs. You can test for DEQ separately. You don't get your tabs until you Pass DEQ

Yes