Making props "world" props.

How do i make a prop (Maybe a Textscreen) to be a world entity? (Making them be with the map, like if i restart or if the server crash, it still will be there.)

I don’t think this can be done, the closest I can think of is saving and loading, but I’m not sure if this can be done in multiplayer or even if it works properly

I’ve seen servers that has Textscreens, and when i hold over them, they are “world” prop.
And when they restart or crash, it automaticly comes on (I guess).

That may be done with Lua code

What Lua code? Where can i find this “lua” code?