I've just found a way of allowing me to work with OF on my laptop and desktop at the same time- Little Snitch
http://www.obdev.at/products/littlesnitch/index.html
It simply refuses to allow OF access to my Airport connection and so I don't get that license nightmare when I accidentally forget to quit OF on either computer before opening it on the other.
I don't think it's against the terms of the license to deny OF access to MY network. And so in effect they are not open at the same time.
Controversial?
Come on Omni this is an organizer at a very high price point (how much have you made in sales of OF alone!?) and I should be able to do this method of workflow. Little Snitch sorts it out.