Ultra-Quickly See an App’s Open Files

This is a tip for those with a multitouch trackpad. By hovering the mouse cursor over any Dock icon and using two fingers to double-tap (tap, not click!), you will switch to Application Windows mode of Mission Control. In other words, this will show the currently open program windows of that particular app. You might also see a list of recently opened files along the bottom of the screen, although not all apps are compatible with this. If the app you double- tap isn’t currently running or has no currently open program windows, you’ll just see the list of recently opened apps (or, in the case of an incompatible app, a blank screen!).

If you find this tip doesn’t work, open System Preferences (Apple menu→ System Preferences), and click the Trackpad icon, before selecting the Scroll & Zoom tab. Then check the box Smart Zoom. Note that this will also allow you to zoom into web pages in Safari by double-tapping with two fingers in the same way (double-tap again to zoom out).