I've just started experimenting with the Applications Management Pack for Oracle Applications (metalink registration required). Unfortunately once all was installed and configured the test instance consistently showed as down.  This was because the apps listener was showing (incorrectly) as down. I accordingly logged an SR as follows.

I am testing the Applications Management Pack for Oracle E-Business Suite. Post installation the status of the Apps
listener shows consistently as DOWN. Because of the way that availability and systems and subsystems are defined in this product the effect is to show concurrent processing, the e-business infrastructure and so on as all down. This is incorrect.