// hook into context sensitive help. Matches with numbers in WindowLinkTable.txt
  int subid = (isimp && !isgf && !is2d && isgeom ) ? 1 :  // input SeisWorks 3D Geometry
              (isimp && !isgf && !is2d && !isgeom ) ? 2 :           // input SeisWorks 3D Attribute
              (isimp && !isgf && is2d ) ? 3 :               // input SeisWorks 2D
              (isimp && isgf && !is2d ) ? 4 :               // input GeoFrame 3D
              (isimp && isgf && is2d ) ? 5 :                // input GeoFrame 3D
              (!isimp && !isgf && !is2d ) ? 6 :             // export SeisWorks 3D
              (!isimp && !isgf && is2d ) ? 7 :              // export SeisWorks 2D
              (!isimp && isgf && !is2d ) ? 8 :              // export GeoFrame 3D
              (!isimp && isgf && is2d ) ? 9 : 0;            // export GeoFrame 2D