Do you know what's the purpose of the FN combination that allows to choose between n-key rollover and 6-key roll-over? If I plug my keyboard via usb, it's already limited to 6-key, right? And if I'm using PS2, why would I want to limit it to 6-key?
And what about the F1, F2, F3, F4? I've read that's for controlling key repetition. Isn't that already set up by Windows under the keyboard configuration panel?