0000950137-05-001097 8-K 1 20050127 1.01 20050202 20050202 CDW CORP 0000899171 5961 363310735 IL 1231 8-K 34 000-21796 05570216 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 c91751e8vk.htm CURRENT REPORT