This image shows
<a href="http://developer.kde.org/documentation/library/cvs-api/classref/tdeui/KPassivePopup.html">KPassivePopup</a>
telling a user they have new mail. The popup is adject to the source of the
message (in this example that is <a href="http://kmail.kde.org/">KMail</a>) and
<i>does not steal the focus</i>, or otherwise interfere with whatever the user is
currently doing. The dialog is automatically hidden after a timeout (or if the
user clicks on it).