how do I get my program to react to the mousewheel?

I'm using VB6 on win98, I've tried subclassing and have found message numbers to trap by printing all message codes to debug but I still can't get that nice feature going where you can hold the mousewheel down and move the mouse to scroll the window. Is there an easier way of doing it than figuring out all the constants for myself and still having to subclass everything i want to use the mousewheel on?

Thanks in advance