I'm a Mac guy, and on a Mac, unless you have sticky keys turned on, all of the modifier keys at the bottom left of the keyboard work exactly the same way: you can press them all you want, and they will do absolutely nothing unless another key is pressed with them.
On windows, the behavior is quite a bit different. The Windows key, obviously, opens the Start menu, and the alt key, if struck once on its own, will prep for a menu keyboard shortcut.
This drives me nuts since I use alt-tab quite a lot, but occasionally will mistakenly hit alt on its own, requiring me to strike it again to toggle back to regular keyboard input instead of menu shortcuts. As far as I'm concerned this is really unintuitive, since alt is used all over the place as a modifier key, but ALSO has a function if you just strike it on its own.
How can I disable that sticky key function entirely?