The Caps Lock extension is usable only for 100-series PowerBooks (excluding the PowerBook 190).

On ordinary Macintosh keyboards, the Caps Lock key either sits in a depressed position while it's down, or a light appears while the caps lock function is on. On earlier 100-series PowerBooks, however, the caps lock is always in an undepressed position and there is no physical light next to it.

For this reason, the Caps Lock extension was born. Whenever the Caps Lock key is engaged, this extension is responsible for drawing a caps lock icon (a thick, hollow up-pointing arrow) at the upper-right end of the menu bar.

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