0000899171-07-000025 4 1 20070517 20070518 20070518 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 KLEIN BARBARA A 0001116705 4 34 000-21796 07863755 8472335459 3600 NORTH RIVER ROAD FRANKLIN PARK IL 60131 4 1 edgar.xml PRIMARY DOCUMENT