Thats basically that it says, yesterday i wondered what the state of scratch was and managed to make a screen sharing app out of it.
using so called extensions the scratch dev community has managed to basically take scratch to a whole new level giving you access to fs calls , new rendering types , gpu acceleration, heck even make 3D games!

First when you Launch it, you’re prompt to select your authority level, either
host
or
client <-- any string is replaced with client