Security is one of those topics you wish would just disappear — because then no one would need to think about it. But until that happens, we’ll end up trying to explain just what’s going on and how you can protect yourself, as happens in this discussion Adam has with Tech Night Owl host Gene Steinberg. follow link
Enter Dashboard, Expose, or Spaces Temporarily
Hold down F9, F10, F11, or F12 (or whatever you've set for the Expose and Spaces keyboard shortcuts) for a few seconds, and then release the key to enter and leave the appropriate mode without having to press the key again. This is particularly useful for Dashboard, in which you can check the contents of a widget and then return to your work with only a single key press.
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Adam Discusses Mac Security on the Tech Night Owl Live