How is that any different then having 5 keyboards and pressing 1 button on only 1 of them ?
Well its different because you rely on a function inside your software to keep an list of the chars and to remember which char last got the key-press and which is next etc. If you had to press 5 different keys defined (1 for each char) on 1 keyboard and remember yourself who was last pressed (and is on CD) and who to press next I'd agree with you that its equivalent of using 5 different keyboards, because you still use your own head to keep track of your CD's.

Just came to think of it: It works a bit like the "decursive" addon for WoW. (An addon that automated decursing of team-members by the press of a button (without having to focus them first)). It was a bit of a debate about the legality of decursive a while ago. Does anyone (pala?) know if decursive still works and if its legal?

My reasoning on this is that is decursive is legal then Round Robin-keys should be legal to. Sounds right?

edit: spelling of "decursive"