0001193125-07-148524 DEFA14A 2 20070703 20070702 20070703 CDW CORP 0000899171 5961 363310735 IL 1231 DEFA14A 34 000-21796 07957113 200 N MILWAUKEE AVE VERNON HILLS IL 60061 8474656000 200 N MILWAUKEE AVE VERNON HILLS IL 60061 CDW COMPUTER CENTERS INC 19930322 DEFA14A 1 ddefa14a.htm DEFINITIVE ADDITIONAL MATERIALS GRAPHIC 2 g70758image001.jpg GRAPHIC