Thanks to everyone who have answered my questions so far. I have a new one that I've been digging on but can find the answer to.
Objective: From a Layout of Films, I want a user to press a button to add a new review.
The tables are Films and Reviews linked by Film ID. There are many reviews to one film, but I don't want the user to see any other reviews. They should only see a New Record Layout.
I tried a Popover, which was great, except it makes a one-to-one relationship with the films. If I could script that to open a New Record linked current film, that would be perfect.
I've tried a New Window, and it's good for opening a New Record in the Review Layout, but I can figure out how to Disable Navigation, so the user can only see the New Record.