There are three categories: Member, Guest, and Renter.
Members are entitled to the whole enchilada. They have a room key that says "DVC Member", and a blue Member ID.
Guests of Members are are entitled free Internet and maybe one or two others. They have a room key that says "DVC Member", but do not have a blue Member ID. It is possible that some CMs will take just the member-designated room key for a perk, but they are not supposed to.
Renters aren't entitled to anything. Their room key will not say "DVC Member". Exchange guests or cash guests booking through CRO are treated as "Renters".
It is up to the Member to identify people they book for as Members vs. Guests. Naturally, rentals are worth more if the Member "forgets" to tell DVC, so many members "forget".