Play with 2 Minecraft accounts at the same time?

Can you play grief games with 2 accounts at the same time? So that you can drop blocks for each other or something?

Yes you can "make yourself friends"

So I'm currently on my server with 2 Accs at the same time. On one game I and the other is the Admin Acc. In theory it should work. But I see 2 problems.

Controlling 2 accounts at the same time becomes impossible. You always have to change the active window
Multi-account usage is often prohibited

Point 2) no one can prove to you anyway and just because both accounts have the same IP doesn't mean that both accounts are served by the same person. Could also be the brother, so from that, nonsense.

It's sad how some people just ignore rules.

Why shouldn't that work? Because of the same IP? Certainly not.

As an admin, I don't have to prove anything. My server my rules. If I suspect someone, that's enough to banish him.