After thinking a bit about it I think that I might actually have an answer to my own question. I think I have been thinking the wrong way about Mathematica's capabilities with respect to events. As usual, Mathematica surprises me with its approach to solving problems. I was trying to shoehorn Mathematica into the mold of other languages when thinking of events. I believe that Dynamic is the answer to my question. Basically if you declare a Dynamic variable and a Dynamic expression which is a function of that variable, you have essentially allowed x to be its own event generator and any expression that is a function of x has essentially subscribed to the event generated when x changes. To me that is a much better model than for instance what I do in C# with .Net Perhaps others can put in their 2 cents.