Has anyone actually seen this work? I dismiss notifications routinely on my iPhone and they're still present in the "All" tab in notification center on my iPad.
The feature is listed on the official iOS feature page: http://support.apple.com/kb/DL1682?viewlocale=en_US&locale=en_US
The feature is listed on the official iOS feature page: http://support.apple.com/kb/DL1682?viewlocale=en_US&locale=en_US