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get_current_screen()->set_help_sidebar(
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'<p><strong>' . __('For more information:') . '</strong></p>' .
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'<p>' . __('<a href="http://codex.wordpress.org/Network_Admin_Sites_Screen" target="_blank">Documentation on Site Management</a>') . '</p>' .
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$id = isset( $_REQUEST['id'] ) ? intval( $_REQUEST['id'] ) : 0;