0000899171-07-000043 4 1 20070914 20070918 20070918 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 KRASNY MICHAEL P 0000942499 4 34 000-21796 071122251 847 291 1166 812 SKOKIE BLVD NORTHBROOK IL 60062 KRASNEY MICHAEL P 20070122 KRASNY MICHARLE P 19950321 4 1 edgar.xml PRIMARY DOCUMENT