Switch Polygon-Selection to Border-Edges

Another one comes to my mind. I see that one can select the Edges which are enclosed inside Selection of several Polygons. But is it also possible to switch the selection to the Edges which make up the Outline of the Polygon-Selection so that one can use these directly for Beveling or Subd-Creasing? Well possible that this already exists, so I'd be glad for a hint.