I have a Microsoft natural keyboard on my Windows 8.1 64bit Dell desktop PC. I want to enter PF5 in order to make my browsers reload the web page, but I don't know how to do that. Each of my PF keys are marked on their top surface with their main function. For example, the PF5 key is marked on top with "Open" and if I click PF5 it does kick up an Open screen. On the front surface of the keys (the vertical surface that faces me) are marked their PFK #s. So on PF5, for example, how do I get it to actually execute PF5 instead of Open? I've tried Alt+PF5, Ctrl+PF5 and Shift+PF5, but all of those execute the Open function rather than the PFK function. Yes, I know this is a really dumb question but please - how do I get the PFK's to actually execute their PF functions? Thanks in advance.