You know how in the properties panels you can have those tabs like “Rendering” and “Transform” and stuff?
For instance, on Characters, they have a Mesh tab for the skeletal mesh, a physics tab for all their physics stuff, etc.
The Category parameter for UPROPERTYs makes that tab. Like this:
&stc=1
It isn’t a parameter you need (if you don’t have a Category set then I believe they’ll be under a tab that’s just your actor’s name), but its useful for organization, and is a good habit to have.
As for quotes, I like to use them all the time just because, but I believe if your category name is only one word you don’t need quotes. So [FONT=lucida console]Category = Rendering and [FONT=lucida console]Category = “Rendering” would work the same, but I believe [FONT=lucida console]Category = General Parameters would not work, but [FONT=lucida console]Category = “General Parameters” would.