tigger:
No one is ever a "dummy" for asking a question!
The zero entry pool at the Poly means that at one end of the pool, literally it is like the beach, where the water in just toe level, then ankle level, then knee level, etc. This end of the pool is great for toddlers, non-swimmers, etc as they can sit/stand in the depth of water they are comfortable with without worrying about going under water, etc.
As for whether or not the Poly monitors non-resort guests using the pool, you will have many differing opinions on this site (some say the CM are watchful and others say that they let everyone and their brother who are non-guests access the pool). We are staying there at the end of May; I am hopeful that the CMs will monitor the pool crowd and make sure that those who are not supposed to be there will be removed. Will it ruin my vacattion if they are not? No! I will not let interlopers spoil a terrific time for my family! Hope you have a terrific time as well!