[Pharo-project] How to easily intercept messages sent to ALL objects ?

Hi folks. I want to intercept (and do something) for all objects. I know few approaches, for example: 1) using method wrappers (implementing run: aSelector with: arguments in: aReceiver) I can wrap all compiled methods of all classes and there I have the receiver. 2) become all objects to some kind of hacky object that stores the original object and that redefines the doesNotUnderstand: But in 1) I need to change all CompiledMehtod of all classes. in 2) I have to become all the objects to another object Then my question is, is there an easier way to intercept all messages send to all objects from the image side (not going to vm) and with a lower cost ? And if going to vm, how ? Thanks. Mariano