The collaborative Renkon-pad itself is a renkon-pad app so you can edit it in this way, too.

It shows the implementation of the collaborative programming environment, and run them in two iframes (they could be in separate browser windows), load the simple counter, and run them. And while it is running, code is edited and the updated code is loaded to the running windows in the live manner.

Here you go: tinlizzie.org/IADocs/px25-...