0000950137-06-001216 8-K 1 20060125 1.01 20060131 20060131 CDW CORP 0000899171 5961 363310735 IL 1231 8-K 34 000-21796 06566438 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 c02031e8vk.htm CURRENT REPORT