So, I bought this new logitech wireless keyboard and mouse from walmarts.  I get home and my dual computer / single monitor display through a kvm switch wouldn't work because the keyboard doesn't have a scroll lock key (which you press twice to activate the kvm switch to switch to another computer).  I use Linux, so the fix was really easy.

First, some details:  The combo package is labeled as Logitech Cordless Desktop LX310 Laser.  It includes a Y-RAZ71 keyboard and a mouse with a tilt-wheel (unknown part number).

The keyboard does not have a scroll lock key.  However, moving the tilt-wheel twice to the left or right activates scroll lock and switches the kvm switch.  This method works in both windows and linux computers without any other settings.  On windows, if you click start-run and type osk for on-screen keyboard and move the tilt-wheel, you will see it does in fact highlight the scroll lock key on the keyboard.