@Serge Merci beaucoup for the recommendation but I had looked at the PharoJS page a few times before and I had not touched it, simply because it's the usual thing that there is absolutely no meaningful information, description, features list etc available. The slides don't really tell anything either and the FAQ mainly tells where to get cups and shirts (ok that was nasty). There are so many merely academic pseudo-solutions especially in the Squeak and Pharo area, most of which have never really made it to production state, that over the years I have become extremely sceptical. It's a great pity in my eyes, because there are definitely many very bright people engaged there and here. Unfortunately, many if not most Smalltalkers are very far away in their perception and thinking from the end-users. The Orca docs are just the total opposite, they are very detailed, extremely professional and very convincing. But I don't know yet about the code behind and because of that I will now give PharoJS a try and look at it.