0000899171-06-000048 4 1 20060517 20060518 20060518 CDW CORP 0000899171 5961 363310735 IL 1231 200 N MILWAUKEE AVE VERNON HILLS IL 60061 8474656000 200 N MILWAUKEE AVE VERNON HILLS IL 60061 CDW COMPUTER CENTERS INC 19930322 SHANKS JAMES R 0001215339 4 34 000-21796 06853297 2280 CHURCHILL LANE LIBERTYVILLE IL 60048 8474656000 4 1 edgar.xml PRIMARY DOCUMENT