Hi Guys,
I have been looking in to this topic a lot and compared it to other CAD packages. A lot of people now days use dual monitors for Inventor, but it still isn't as efficient as it could be.
There are two ways of doing it on Inventor that I am aware of, the one would be stretching over both screens, which I hate because then your ribbon and tools are only on one screen and it takes a lot of time going back and forth just to use the commands. Besides that your browsing history is also only on one screen. Another reason is also when you have two different screens sizes it doesn't always work out so well.
The second would be opening Inventor twice and having one open on both screens, which I prefer, but this also doesn’t really work out so well, because if you are working (standalone version or vault), you can't work on the same project on both Inventors and save files. Another reason why this doesn’t work so well is that all of the pop-up windows, such as constraints, hole tool, measuring etc. keeps opening on the last screen that it was opened. You will know what I mean if you try it out. One of the biggest problems with this solution is that it kills your RAM even though your pc is top of the range.
If you take a look at the link below this is what I had in mind for the layout of the screen:
http://forums.autodesk.com/t5/inventor-general-discussion/dual-monitor-setup/m-p/5427161#M529867
I also think you would need some kind of setup screen inside Inventor (Either an add-on or part of Inventor General Settings), where you can choose which screen opens Assemblies, Parts and Drawings.
I really hope to see this in the new release this year and I am sure everyone using dual monitors feels the same way. Please vote for this Idea if you agree!!