Appendix zu ``Kazhdan-Lusztig-Polynome und eine Kombinatorik für Kipp-Moduln''
This is a brief exposition of part of
Lusztig's new work on ``periodic W-graphs'' in the spirit of the paper,
to which this is an appendix. This appendix is also integrated in
the german on-line version of the published paper, which I keep
on my homepage