On windows CTRL + TAB will allways switch between active windows in a program. You can also see which windows are open in the Window menu.
Sometimes I use Trace Reference to keep toggling between two views (there is a button to switch the trace around).
I have F2 as hotkey for plan view, CTRL F5 to show all in 3D window.
Maybe these things can help?
Erwin Edel, Project Lead, Leloup Architecten
www.leloup.nlArchiCAD 9-26NED FULL
Windows 10 Pro
Adobe Design Premium CS5