0000950137-07-000837 SC 13G/A 1 20070124 20070124 CDW CORP 0000899171 5961 363310735 IL 1231 SC 13G/A 34 005-49213 07548822 200 N MILWAUKEE AVE VERNON HILLS IL 60061 8474656000 200 N MILWAUKEE AVE VERNON HILLS IL 60061 CDW COMPUTER CENTERS INC 19930322 KRASNEY MICHAEL P 0000942499 SC 13G/A 847 291 1166 812 SKOKIE BLVD NORTHBROOK IL 60062 KRASNY MICHARLE P 19950321 SC 13G/A 1 c11630sc13gza.htm AMENDMENT TO SCHEDULE 13D