Try shaking the keyboard (or using a vacuum cleaner -- if people eat at their keyboards food and other sticky junk gets caught underneath the keys.)
The ALT-F3 key used for opening the Deskbar.
It's used to activate a search or put the computer to 'sleep'. Pressing F3 on its own drops down a small window where you can type a word (or words) to search for. Once you enter the search string - successive presses of the F3 key will jump to the next occurrence. Pressing the Fn key + F3 together puts the computer into sleep mode.
crtl + f3
Use it to get into a buliding
F3 button
alt+f3
use of f3- switching of open companies.
The F4 button comes after the F3 button on the keyboard. * Cait
You probably are looking for F3. This enables you to search for text in most programs, including your internet browser. A few programs use their own special settings, so F3 does not work, and you must find the option in a menu.
ctrl+shift+f3
F3
In the key of F with a range from C5 to F3.