It is scary, isn't it? My three year old grandson can start up Gramma's puter, open Internet Explorer, open 'Favorites', then scroll down to Nick Jr. icon and open it. Then he finds whatever Nick Jr. game he wants to play. When I do something on the computer like adjust the sound, he's watching like a hawk and asks 'Whatdat?' If he sees me doing something once, he can repeat it the next day. I watch him play computer games (which are great, by the way, they teach shapes, colors, following directions, problem-solving, etc.) and just wonder in awe as to how his three year old brain works.
Maybe your four-year old can clue the rest of us in on how to use EQ!
Editted to add: On the other hand, maybe this is a testament to the design process. Little ones don't know what they 'are not supposed to do" so just go ahead with their instinct. We have, somewhere along the line, have learned that 'you can't get there from here' so we tend to have built-in resistance to following our instincts. Sheesh. I haven't even had my coffee yet!