0000950137-03-002981 10-Q 3 20030331 20030515 CDW COMPUTER CENTERS INC 0000899171 5961 363310735 IL 1231 10-Q 34 000-21796 03703568 200 N MILWAUKEE AVE VERNON HILLS IL 60061 8474656000 200 N MILWAUKEE AVE VERNON HILLS IL 60061 10-Q 1 c77018e10vq.htm QUARTERLY REPORT EX-99.1 3 c77018exv99w1.htm CERTIFICATION OF CHIEF EXECUTIVE OFFICER EX-99.2 4 c77018exv99w2.htm CERTIFICATION OF CHIEF FINANCIAL OFFICER