PINS and codes

[AlleyKat]

What is the difference between a PIN and a code?

I'm going to Georgia next month then driving to WDW, where I'll spend a few days(3). I plan on staying at POFQ and would love a room only discount.

I've obtained a code for such but want to know how one finds/gets a PIN for discounts.

Is there a huge difference in what the two offer?

Does one mention they have a code or PIN when calling for reservations?

Thanks to all who respond!