-ne runs the game in windows mode so that you can continue to work in other files while it is running. This is extremely useful.
There's another that disables the video (nm) but that is not very useful as you can just press escape.
the -ai switch is useful if you want to check some things such as CTDs, victory conditions, AI personalities, etc. It runs the campaign as normal except that your selected faction's turn is taken by the AI - just sit back and relax ;)
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