Afraid the sort answer is no...
The Express/Expression offline editor is offline only. It doesn't output any levels, meaning you can't connect a visualiser to it.
Our newer consoles like Eos and Congo do support this with their offline editors - they output levels at a reduced rate that can be picked up by a visualiser like WYSIWYG (http://www.cast-soft.com/) or Capture (http://www.capturesweden.com/).
The only way to use visualisers like this with Express is to use a physical console and a DMX-USB device that works with your visualiser.
Similarly, the offline editor for Express doesn't provide remote control of the console, and again this is provided with our newer consoles (It's known as 'Client' functionality).
Hope that helps.
Tom
If you already have a WYSIWYG dongle Emphasis Offline can be used to do some pre-visualization. It is, however, very easy to get in trouble moving your show back to a console without Emphasis if you did not keep in mind the significant limitations of the actual hardware console versus Emphasis. In other words: Emphasis has a much larger feature set than your Express and if you don't program within the means of your console while using Emphasis Offline, you may wind up a very unhappy camper. Probably why Mr Steer didn't mention the possibility earlier. I have, however, found it to be very useful in certain applications as long as I pay close attention to my programming.
Best,
John
www.etcconnect.com