0000950137-05-004779 8-K 1 20050422 8.01 20050422 20050422 CDW CORP 0000899171 5961 363310735 IL 1231 8-K 34 000-21796 05767910 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 c94524e8vk.htm CURRENT REPORT