d26f6791_e___Integration_ITB092___TWiki__Explanation
[Option] app_dir [Values Accepted] String [Explanation] 
The app_dir setting should point to the directory which contains the VO specific applications, this should be visible on both the CE and worker nodes and will be accessed via $OSG_APP. Only the CE needs to have write access to this directory. The $OSG_APP directory must also contain a sub-directory (etc) with 1777 permissions.
ConfigurationFileStorage < Integration/ITB092 < TWiki
Explanation