What is the difference

Hi all, I'm (FNG) philetus. This is a great forum.
I've been playing with Andy's tool and I modded my bios. I don't know what it would do if I flashed it. I used the slic 2 setting.
It probably didn't need it?
I turned Lenovo-36CN23WW(V2.09).rom into Lenovo-36CN23WW(V2.09)_SLIC.rom.
What exactly did it do to the bios?