host can now be get as a global value: instead of always copying host from class to class, it can now be gotten from a global class with: from cagou import G then G.host will give host. This will probably be used on the long term on all SàT (backend + frontends). As host is currently needed in several places (most importantly in QuickFrontend), the argument is still present, and must be there even is unused on class inheriting from QuickSomething.