-wxPen uses a reference counting system, so assignments between pens are very
-cheap. You can therefore use actual wxPen objects instead of pointers without
-efficiency problems. Once one wxPen object changes its data it will create its
-own pen data internally so that other pens, which previously shared the
+This class uses \helpref{reference counting and copy-on-write}{trefcount}
+internally so that assignments between two instances of this class are very
+cheap. You can therefore use actual objects instead of pointers without
+efficiency problems. If an instance of this class is changed it will create
+its own data internally so that other instances, which previously shared the