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Fn is a key found on most laptops and some desktop keyboards - it's basically a modifier key you hold down and press another key to perform an action (which a full size desktop computer probably has either a key or a button for). The most common is the F1 - F12 function keys often perform other duties such as adjusting brightness, volume or disabling a trackpad mouse on a laptop. On some keyboards you actually have to press Fn+function key to perform the regular function, which is frustrating - you can normally toggle that, but exactly how varies from keyboard to keyboard.
In terms of figuring out what keys do, if you press NVDA+1 (the 1 on the number row, above q) it puts NVDA in Input Help mode. Any key you press while in this mode won't do anything, but NVDA will tell you what it is, so it can be a way to find your way around a new keyboard without sighted help.
If you normally use F7 to mute NVDA, that's not an NVDA keystroke, but it's likely that is the key to mute your computer's sound. The keystroke to mute NVDA is NVDA+s, but if F7 works, that's achieves what you need. If it's not working right now, it might be that you've accidentally toggled your function key Fn lock.
On Fri, Jan 15, 2021 at 5:55 PM Neil Campbell <nrcampbell@...> wrote: