Scratch

( [any reporter here] of user [user ^] in mesh session )
Reports the reporter of the user in the mesh session.

[start mesh API and invite user [user ^] ]
Starts the session. Unlike the previous user dropdown, this one can choose anybody logged into Scratch.

[invite user [user ^] ]
Same as above, but used if the mesh API is already running.

<mesh API running?>
Reports if the mesh API is running.

[leave]
Player leaves the mesh session.

( [list here] of user [user ^] in mesh session )
Same as the first block, but for lists instead of reporters/booleans.

Also add a Mesh Sessions group on the homepage.
Add a Stop Mesh button near where the green flag is too.