unit, on jumping, say if you hit jump for all your characters, if I were watching you I'd see them all jump at the same time, much the way you see them jump at the same time on their individual screens.

But if you're just looking at say, your main's screen, you see the jump command after it passes through the server and gets back to your main's computer. So there's some latency there.

The true jump for the server is the keypress, your position is recorded then, so on your screen when you jump at the very edge of something you won't fall because of lag. It just takes time for the server to receive it and spit it back out.