The application i'm working on can be displayed either on multiple monitors or as tabs on 1 monitor. All the top-level controls will be located on 1 (main) screen and additional screens will display whatever is in tabs. In attached mock-up you can see that i have 3 positions left where this button can be placed. I feel it should be on the left side of the second level of menu, but i would love to hear what you think.
