rhns-applet package installed on the Satellite. The package can be found in the RHN Satellite software channel for versions 3.4 and newer.
rhn-applet-actions package with up2date or through the Red Hat Network Tools software channel. Install the package on all Red Hat Enterprise Linux 3 and newer client systems to be notified of custom updates with the Red Hat Network Alert Notification Tool. The client systems must be entitled to the Management or Provisioning service levels.