This is Basic a plugin, that can run the plugin script in studio.
I’m sure DaMrNelson can explain more how it works, if it’s needed 
I don’t quite see why you’d need this, when you have the C-side command bar.
Oh haha, that. That’s pretty much my first real attempt at the new plugin system. A look at one of my better ones would be here. It allows you to resize models, although it is still a bit buggy. However, I’m pretty proud of the grade 2 math I managed to pull off while making it.
Plugins have access to the plugin library. This is basically just to help you get quick and simple access to the plugin features.
Edit: Also, plugins have a scripting identity of 1, whilst the command bar has an identity of 5. But don’t ask if that means that plugins are more powerful that the command bar, cause I really have no clue. (Scripts have an identity of 2, wat?) I’ve heard rumors that say they are, but they have all lacked proof.