interface WindowCollection {
/* IID: { 0xa6cf906f, 0x15b3, 0x11d2, \
  { 0x93, 0x2e, 0x00, 0x80, 0x5f, 0x8a, 0xdd, 0x32 } } */

     readonly attribute unsigned long   length;
     Window                      item(in unsigned long index);
     Window                      namedItem(in wstring name);
   };