It's just like Rockin' Rio. I actually sprayed Rio on one arm and Luxe on the other and I can't distinguish them. The only difference, and it is minor, is that Live Luxe's dry down is a tad (just a tad) more chemically than Rockin' Rio's.
A confirmation letter is a correspondence sent to confirm details, like oral agreements, appointments, and job interviews. The letter can also confirm a reservation, a response to an invitation, receipt of a various items or services, or travel arrangements.
A certified letter is one where the post office ensures that the letter is only delivered to the person it was addressed to, and records his signature. Anybody can send a certified letter to somebody, for a fee. Legal papers are usually sent in this manner. There should be a return address on the paper slip.