IS Boxer renders each of the windows at full size.
That's what allows instant swaps and accurate mouse broadcasting.
You can disable instant swapping, and that will decrease the load on your system.
But then you lose out on the insta-swap and accurate mouse broadcasting.
For a basic overview of how to use the Toolkit, take a look at my guide: http://www.dual-boxing.com/threads/2623 ... %28Long%29
You can, in your character set, limit the frames per second on the slave windows.
You can also set the eye candy to dynamically be higher on the main, and lower on the slaves: http://www.dual-boxing.com/threads/3265 ... lysm/page3
For the assist and follow to work, you will want to ensure the IS Boxer addon is enabled on all accounts.
The default (wizard assigned) FTL Modifiers are good; they won't interfere with your in-game macros or keybinds.
You just need to make sure not to have F11 (I think that's the default bind the wizard generates) bound to anything.
If you bind say Shift F11 to something on one character, and any of the characters use Shift as their FTL Modifier... then you'll have issues.
You can check the keybind for FTL Follow Me, in the Toolkit, and then go into game (on each toon) and bind Shift + That, Alt + That, Ctrl + That, etc...
Pick an unused keybind, and bind each combination and then unbind them.
IS Boxer has two broadcast modes, basically.
Repeater/Broadcast is a 1:1 broadcast, like Keyclone.
Anything you press, is sent to all windows.
With the exception of hotkeys for any mapped keys you have built.
You won't be able to use Repeater/Broadcasting to move, including the right click or whatever.
Like KC (or any other boxing software), you'll want to use Follow with Repeater/Broadcast off.
Create mapped keys, for things you want the other windows to do.
It can be a variety of actions and targets.
You can have only your Warlocks Lifetap, by sending that keybind/macro-action to the Warlock Group (which you would make in Action Target Groups).
For a strong overview of the Toolkit, check my guide I linked above.
You'll be comfortable with the basic actions of the Toolkit, once you go through the examples in the Keymap/Mapped Key section.