

You usually get the book corresponding to your faith, so that would be an option. Given that the Bible (can’t speak mich about it but way less about the others) has chapters and verses and what not, addressing single words is simple.
For the “name of relative is the code”, yeah that needs a good memory.
For domains, you actually own them. If you define ownership as being able to trade them compared to leasing something where you are not allowed to sell the item for example.