0000899171-07-000008 4 1 20070201 20070205 20070205 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 ECKROTE DOUGLAS E 0001215329 4 34 000-21796 07578967 4484 NORMANDY CT LONG GROVE IL 60047 8474656000 4 1 edgar.xml PRIMARY DOCUMENT