Keeping Alt depressed and selecting Tab cycles through the list. Releasing selects the highlighted application window. This key should be used with caution, if at all. A document, even a headline of a document, produced in all caps is hard for the eye to scan. If you are producing documents, or slide shows, for the purpose of communicating with some audience, you should avoid anything that makes that communication less clear.
All caps is difficult for voice recognition software to interpret.
All caps in Email is widely understood to be shouting or yelling at someone. Furthermore, new users should not be taught to use the caps lock key in place of depressing the Shift key to produce capital letters. Please share them with me by Email . The obvious use of this key is to allow selection of capital letters when depressing the alphabet characters, or selecting the characters above the keys on the row just below the F keys. Depressing the Shift key while inserting a CD-ROM will bypass autoplay.