0001181431-13-036902 3 2 20130626 20130626 20130626 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 ZIEGLER ANN ELIZABETH 0001214029 3 34 000-21796 13935794 ONE EAST WACKER DR CHICAGO IL 60601 3 1 rrd384391.xml FORM 3 EX-24. 2 rrd345726_391008.htm POWER OF ATTORNEY