for complete functionality also install mods: areas, jailbox, teaching (preferably my fork, link below), freeze, invmanagement, bookmarks_gui (preferably my fork, link below), invisible.
message all students or a student using a custom dialog (center of screen, stops interaction).message all students or a student using on-screen chat (top of screen, unintrusive).clear inventory of all students, a student or yourself invmanagement.define a new itempack from your current inventory.give itempacks (collections of items) to all students, a student or yourself.
Note 1: Buttons will only show up if optionally their respective mods are loaded The project is a collection of mods (a modpack) that allows teachers to feel in control of the students while in game.
The original idea was described in this Minetest forum thread. The goal of the MinetestEDU or EDUtest project is to make Minetest easy to use by a teacher in a classroom environment. It depends on my fork of edutest-chatcommands mod by Isidor Zeuner. This mod provides user interface extensions for the MinetestEDU/EDUtest project.