The REPL way of thinking may not be the right level for this kind of a system. I may be underestimating the complexity of this, but it does seem doable with so

The REPL way of thinking may not be the right level for this kind of a system. I may be underestimating the complexity of this, but it does seem doable with some clarifications to concepts. For example, in the smalltalk world, every GUI object created is expected to be inspectable and modifiable. If we then require that we want to call a button instantiated in every browser an independent object, that would be a misfit. It might be adequate to treat that button presented in the IDE context as the object that manifests on all connected browsers. So when I look for messages sent by the button, I tap into the logstream for those events that the system received from all browsers connected. But when I manipulate its appearance, it reflects on all connected browsers. I don't literally need to tap into each connected browser client.