the basics principle of multiboxing (do we have a tutorial for that somewhere on twiki?) is that at any given point in time you drive one character (main) and the others follow - which is why you don't pass the movement keys to other windows and having the game support follow (and some sort of way to assist) is a must

luckily aion supports both; though somewhat less well as wow; yet enough to play. see the macros I use
http://www.smileyouareontv.com/aion-...rs/aion-macros

one issue with aion though is gliding is by default bound to the space bar - which isn't yet able to send as a background movement key (though I'm working on this with freddie) - so far I glide my 2 toons seperatly; which makes me slower for some things and may be an issue in the abyss later - but you can fly (page up is broadcast) and follow and that works (though you waste some precious flight time at the beginning to make sure your slave(s) are following) - in short it's a bit klunky bit it's doable/boxable (you can watch my videos and see)