[Haskell-beginners] firering event in netwire

Hey, I have a few question about the usage of netwire: How do I fire events? For example my main wire should take keyboard events as input and output some state (which is than somehow outputed). I see that there is an event type, which has the some type as the identiy wire. I am just not sure how to use it? Or asked differently, how is the "keyDown" event defined, that was talked of in an earlier mail? Thanks! Nathan