0000950137-07-001078 8-K 1 20070124 5.02 20070129 20070129 CDW CORP 0000899171 5961 363310735 IL 1231 8-K 34 000-21796 07561313 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 c11807e8vk.htm CURRENT REPORT