How will war affect business and the stock market?

As you know, there is continual talk of possible war in Iraq....

Without getting too much into the politics of it all - how will war affect day-to-day business? How could it affect the stock market?

Does anyone have any insights? For example, does anyone know how business etc. was affected in the 1990-91 war in Iraq?

Thanks.... I don't know much about this topic, but it could affect all of us....

- Dien