Is there a button on the keyboard that does nothing?

CAPS LOCK

Scroll Lock. It's what I use for my Vent key. I've never missed it when doing stuff while chatting in Vent.

Depends on your keyboard. Usually the medium to high F-keys (F13–F16 on my older Apple keyboard) aren't used for much. On Windows keyboards, scroll lock isn't used much. Is there not a way to set Ventrilo to use a mouse button rather than a key?

• Scroll Lock

• Pause (though ctrl-pause does do something)

• Shift+PrintScreen

Though all these keys tend to be piled together in a hard-to-reach area in the keyboard.

F7 - F10 rarely do anything. Or you can try Win+[key].

Opera, for some inexplicable reason, uses F8 by default for selecting the address bar (every other browser and file manager uses F6). One app (KATE I think) uses F10 for word wrap, so I added this to other apps where possible.