Mouseover and Multiboxing

[intoxx]

What you are asking for is basically "multi-pointer" and pointer synchronization at the same time (AKA "real mouse broadcasting") and you can't do that without using ISBOXER (if we're talking about Windows operating system).
But you can easily find a way to duplicate every click on your main to every slave window (you basically only have one pointer but when you click it will move and click to other windows aswell).

You have to be careful when doing that tho, it's not as easy as it seems, you never have perfect angles camera, what I mean is that when you move all of your characters, your main will have a different angle than other slaves and a small difference can mess with the click accuracy.

You should also take a look at the "interact with mouseover" keybind which is very useful.

Intoxx.