I have set up a page menu. Is there a way in Atahualpa Theme Options or anyplace else on the Dashboard to get the menu items to open in separate tabs so that I can simply click them down and thereby return to the Home page? As it is currently set, the only way I can get back to the Home page is to use the Windows "Back" arrow.

This is not a theme feature but a WordPress Feature. You will need to manually create your menu's

1) go to dashboard->Appearances->Menu
2) in the top right you will see a tab 'Screen Options' click on it
3) check the 'Link Target' option.

Now when you add a menu item, there will be an check box labeled 'Open link in a new tab'

Thanks! Worked like a charm!