I double-click and nothing happens. How come?

The most common cause of this problem is a mouse setting that is too sensitive. The way to change this setting is to bring up the Mouse control panel. Under Windows this is found in the Start menu under Settings under Control Panel. Under the Mac OS, Control Panels are found in the Apple menu. Decrease the double-click speed. This will make it easier to double-click something and see the results.

If the mouse setting is not the problem, then it's time to ask whether the object you are double-clicking should do anything. Here is a list of objects that should do something when you double-click.