code: def get_installed_extjs_apps():
      
      installed_apps = []
      checked = set()
      for app in settings.INSTALLED_APPS:
          if not app.startswith('django.') and not app in checked:
              checked.add(app)
              try:
                  installed_apps.append(get_appinfo(app))
              except LookupError, e:
                  pass
      return installed_apps
docs: Get all installed extjs apps.
  
      :return: List of ``(appdir, module, appname)``.