Instruction: Answer the given question using the supporting document.

Input:
Question: I don't see an FN key.  How do you make the F1 through F12 work with their alternative key assignments?
Document: The keyboard is much smaller (est 2/3 size) than a standard ergonomic keyboard - MS Ergonomic 5000. The number pad is separate (not an issue if you don't use it much) and the keyboard's keys feel more like a laptops key presses than a regular keyboards. There is a unique FN slide switch which allows you to switch from special functions to standard F1-F12 keys.
I could even accept narrow and misplaced function keys, how ever nonsensical it is (they saved what, 0.3"? ), and that they behave more like buttons than keys. I could do without multimedia buttons (they are integrated into F1-F12 now but it makes them completely impractical, particularly now when they have to be switched on by a switch, not a standard key).
Good: The keyboard and the mouse look nice and modern.Bad:- The key layout is unusual. Microsoft changed the positions of Delete, Home, End, PgUp, PgDn keys, and it's messy.- The function (F1..F12) keys and media keys are shared.
)Mouse USB refresh rate is only the standard 125 Hertz - which is actually not bad for a wireless mouse, but nowhere near today's gaming mice which can all do 500-1000 Hz.The bad:The escape key is delegated to being a half-sized, barely-moving shallow button rather than an actual key, as are the F1-F12 function keys.Alternate function keys (the usual 'multimedia' shortcut buttons for volume, play/pause, etc.)
I will see if the space bar works itself out. If not I will try to see if Microsoft says it's just faulty and I should exchange it. The jury is still out on the FN key setup. I'd rather give this a 3.5 but I think a 4 would be misleading. I promise to update this review when I've spent more time with these devices.
Which means if you have any use for the F1-F12 function keys whatsoever, you'll never ever get to use the alternate functions.All in all it's got the sexy look and enough advantages (near silent typing!)
Since I have no use for the special functionality and I use the F1-F12 keys a lot, this is cool. On my previous Microsoft keyboard I had to manually configure the func keys through the Microsoft Keyboard and Mouse center for them to always perform as F1-F12 , which was a pain. The keyboard profile is relatively low and no extra multimedia keys which I never use.Con: The keyboard came with discharged batteries so I had to replace them.
Volume keys and play/pause key work just fine, and that were the only key I needed with my old keyboard. Only key I will probably miss would be calculator key, which is still on but does not work. For the record of who wonders how about brightness, F14 and F15 are mapped to control brightness (OS X default), and you may remap F13 or any other function keys (F1~F15) to associate with your choice of feature with 3rd party drivers, like "BetterTouchTools."
Extremely poor function keys. The function keys are, in fact, buttons and not keys.2. No media or other keys:  Did you use any of the media keys on the MS Natural Ergonomic 4000? They're gone. Replaced by a crappy slider to toggle function &#34;buttons&#34; from F1 to F12 to media keys.3. Home, Page Up, Page Down, End Insert and Delete are all crammed together on the right side of the keyboard.
I always find it in the wrong spot on the desk. Another topic that I will watch over and see how it goes after I've had more time to adjust.One final piece of happy candy about this keyboard: a slide-able select button that allows you to choose between F keys (F1 F5, etc.) and Microsoft function keys ( Open close, settings, sound, etc.)
Answer: The toggle switch is the only way to enable the Fn keys.  There is no alt-esque Fn key that you find on some laptops.  I'm used to have dedicated volume keys above the function keys on my keyboard and it's a small nuisance to click the switch over to use the mute/volume up/down on F2/F3/F4 but it's bearable.  It's also much nicer than the caps lock style Fn toggler which is always just confusing.