[OtZman]

I've played through the demo, and it was great fun! Had to turn down the graphics quality a bit though for it to run smooth.

If you want to play as NOD in skirmish mode, click the dropdown menu, click on NOD and hit 'n' on the keyboard. Do the same way, but hit 'g' instead if you want to set the AI to GDI. Works for all the options that aren't available.