Rasa handles a text input and gives an output according to the detected intent.
Opening a new window is completely unrelated to Rasa. You will have to find a way to send a signal to Rasa when this happens, maybe via a payload like /inform{"window_opened": Date.now()}, with inform being an intent and window_opened a slot and entity.
I was having some trouble following documentation, but I’ve found out that the videos on RASA youtube channel are great so I’m doing fine now, no silly questions for a while haha.