I feel like this should be common knowledge, but I can't figure out how to make a gui/frame always appear on top of other guis. I know that the guis in the core gui directory do this automatically, but I don't think you can mess with that on the server side. Please correct me if I'm wrong.
EDIT: I read through my question, and just to clear up any confusion, I'm talking about separate screen guis, not frames inside of one specific screen gui. Also if this question already exists, please link it to me, but just to be clear, I DID try to find this on the web but had no luck.

3 comments
I think in the screengui there is a DisplayOrder property, the highest one displays first I think.
Try using "Zindex"
What @AmazingLeobreaker66 said, there is a property called DisplayOrder in ScreenGui objects. Go ahead and make the GUI you want to always be in front a huge number.