Ignore Windows

Use the :filter-window hook for this: 

(:add-hook (in jwno/context :hook-manager) :filter-window
   (fn [_hwnd uia _exe _desktop]
     (not= "SomeNaughtyWindowClass" (:get_CachedClassName uia))))

This code ignores windows according to their class names. Change (:get_CachedClassName uia) into (:get_CachedName uia) if you want to check the windows' title instead.

Please see Windows documentation for other useful properties you can get from the uia object.