Toshiba Satellite L755 - Manual (Page 112)

User’s Manual 5-4
The Keyboard
Wireless: Pressing FN + F8 enables/disables the wireless devices.
Touch Pad: Pressing FN + F9 enables or disables the Touch Pad function.
Zoom: Pressing FN + Space changes the display resolution.
Reduce: Pressing FN + 1 reduces the icon size on the desktop or the font
sizes within one of the supported application windows.
Enlarge: Pressing FN + 2 enlarges the icon size on the desktop or the font
sizes within one of the supported application windows.
Volume down: Pressing FN + 3 decreases the volume in increment.
Volume up: Pressing FN + 4 increases the volume in increment.
FN Sticky key
You can use the TOSHIBA Accessibility Utility to make the FN key sticky,
that is, you can press it once, release it, and then press an "F Number"
key. To start the TOSHIBA Accessibility utility, click Start  All
Programs  TOSHIBA  Utilities  Accessibility.

If no wireless communication device is installed, no dialog box will appear.