Here we see scroll lock doubling as a button to switch between windowed and full screen mode on your current application. Pause Maximises and minimises windows.
A special X button will let you close Windows quickly (you know...in case, like, your mum walks in...or something)
The number pad to the right has a key arrangement doubled up on top of them. If you want to use it as a number pad, then just tap num-lock.
Freaking me out is the placement of the directional arrows right underneath the number pad; it takes some getting used to.
Just to show off, here's the gaming keys with the purple backlight on...very pretty.