Hi folks. I need to intercept all messages. For such purpose, I modified Interpreter >> normalSend like this: normalSend "Send a message, starting lookup with the receiver's class." "Assume: messageSelector and argumentCount have been set, and that the receiver and arguments have been pushed onto the stack," "Note: This method is inlined into the interpreter dispatch loop." | rcvr | self inline: true. self sharedCodeNamed: 'normalSend' inCase: 131. rcvr := self internalStackValue: argumentCount. (self isIntegerObject: rcvr) ifFalse: [ self doSomething: rcvr. ]. lkupClass := self fetchClassOf: rcvr. receiverClass := lkupClass. self commonSend. But now, from the IMAGE side I would like to enable or disable such intercept. It would be great if from the Image side I can set a value to a boolean and read such value and ask, from the VM side. Do you know if I can do this? Should I use specialObjectArray ? If true, can you give me a hint of how to do it ? Thank you very much. Mariano