He's saying something like, if you were to execute the command.
!tp <usergroup> <user>
like, !tp admin Duke, which would teleport all the admins to me.
FALSEYou'd want !bring for that.
On topic... I think this'd be great.
E.G.
!tp #admin would tp all admins to my target position
!bring #admin would bring them, etc
!jail #user might be a good one too, as well as !god, hp, etc.
The reason I put a # before the usergroup is because there could easily be someone with "Admin" in their name ingame and # would signify that you're targeting a usergroup rather than a specific player.