0001181431-13-036924 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 Richards Thomas E 0001322889 3 34 000-21796 13935818 1801 CALIFORNIA, SUITE 5100 DENVER CO 80202 3 1 rrd384374.xml FORM 3 EX-24. 2 rrd345709_390976.htm POWER OF ATTORNEY