/*When it is minimized or restored, all the windows
   in OpenWindows will also be minimized or restored. */

Def WM_SYSCOMMAND(self,wp,lp | choice)
{
  WM_SYSCOMMAND(self:ancestor,wp,lp);
  /* last four bits are used internally by */
  /* MS-Windows, so mask them to get       */
  /* the real value:                       */
  choice := wp bitAnd 0xFFF0;
  select
    /* the minimizebox clicked, so iconize all windows in OpenWindows*/
    case choice = 0xF020
       do(OpenWindows,{using(win) show(win,2)})
    endCase

    /*icon double-clicked or menu choice Restore is selected,*/
    /*so restore all windows in OpenWindows                         */
    case choice = 0xF120
       do(OpenWindows,{using(win) show(win,1)})
    endCase
  endSelect
}