By default it runs code from a file called "tmp.lua" at your worldpath, which you need to create yourself.
You can e.g. kick this player called "admin":
* go to the folder of the world which is used
* add the tmp.lua file
* open it with a texteditor
* write minetest.kick_player("admin", "Why do you use such a name? We all know that you are not a real admin.")
* save it, e.g. by pressing ctrl+s
* be happy that it worked
l put these links here
http://dev.minetest.net/Category:Methods
http://dev.minetest.net/minetest.chat_send_all
http://dev.minetest.net/minetest.request_shutdown
http://dev.minetest.net/minetest.kick_player
License: WTFPL
Download: zip, tar.gz
github: outgame_intervention
If you got ideas or found bugs, please tell them to me.
How to install a mod?