0000950137-07-014276 8-K 1 20070917 7.01 20070918 20070918 CDW CORP 0000899171 5961 363310735 IL 1231 8-K 34 000-21796 071121406 200 N MILWAUKEE AVE VERNON HILLS IL 60061 8474656000 200 N MILWAUKEE AVE VERNON HILLS IL 60061 CDW COMPUTER CENTERS INC 19930322 8-K 1 c18661e8vk.htm CURRENT REPORT