This excerpt taken from the HPQ DEF 14A filed Jan 29, 2008.
9. What should I do if I receive more than one notice about the Internet availability of the proxy materials or more than one paper copy of the proxy materials?
You may receive more than one notice or more than one paper copy of the proxy materials, including multiple paper copies of this proxy statement and multiple proxy cards or voting instruction cards. For example, if you hold your shares in more than one brokerage account, you may receive a separate notice or a separate voting instruction card for each brokerage account in which you hold shares. If you are a stockholder of record and your shares are registered in more than one name, you may receive more than one notice or more than one proxy card. To vote all of your shares by proxy, you must complete, sign, date and return each proxy card and voting instruction card that you receive and vote over the Internet the
shares represented by each notice that you receive (unless you have requested and received a proxy card or voting instruction card for the shares represented by one or more of those notices).