When you open the virtual keyboard (On-Screen Keyboard) on Windows seems that the F keys (F1, F2, F3, F4, F5, F6, F7, F8, F9, F10, F11, F12) row is missing but really is only hidden.
Solution:
Click the Fn key
then you’ll find the F keys in the first row
Update of 01/06/14: More persons asked me more info because they thought by mistake that Fn button is the same of the Fn button in laptop’s keyboard.
If you need to enable/disable WiFi for example in Windows 7, you could use the WinKey + X
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