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Here’s a list of things you can ALT+Click (Option key ⌥ + left mouse button) in Mac OS X:

• ALT+Click on the WiFi icon in the menubar gives you detailed information about your selected WiFi network
• ALT+Click on the volume icon in the menubar lets you quickly select audio input and output device
• ALT+Click on any of the triangles on a tree-ish view (Finder in listmode, IDEs etc.) expands or collapses all subitems
• If you have multiple Time Machine volumes attached, ALT+Click on the Time Machine icon in the menubar lets you browse other Backups than the default with that spacy interface
• ALT+Click on the BlueTooth icon shows some information about your device id
• ALT+Click on the battery icon shows the health of your laptops battery
• ALT+Click on the maximize icon in the title bar restores the old behavior of Mac OS X to maximize the window to the desktop and not going fullscreen
• ALT+Click on the notification icon in the menubar toggles “Do not disturb” mode for notifications
• ALT+Shift+Volume keys changes the volume in ¼ increments or decrements
• ALT+Shift+Brightness keys changes the brightness in ¼ increments or decrements
• ALT+Click on the (green) fullscreen button in the title bar of application windows maximizes them “the old way”, that is: maximum size on the screen, not fullscreen. Same effect as double click on the title bar
• ALT+Click on the Dropbox icon changes the (new) graphical version to the list version showing usage, available space and more (Thanks, Mario)

If you know more, please leave a comment because: