First of all, thanks for all the input, didn't think such a trivial question would arise such a fruitful discussion :)
the send/receive "magic" in the iemguis are explicitely designed to allow the same send/receive names in order to sync several different objects. of course you can do this explicitely. iemguis just help to make this simpler.
Nice. It was a point about the iem gui objects I was missing/overlooking.
Bests, Lorenzo.