Application Repository 

All Portal Runtime applications deployed in the portal are stored in the PCD via the application repository, which provides a special JNDI interface to the PCD. There is one application repository per cluster, and all nodes share the same content.

The application repository provides information on all available applications, components and services, as well as application configuration information.

The application repository provides the following JNDI contexts for the PCD:

Context	Description
com.sap.portal.system	Root context
com.sap.portal.system/archives	Lists PAR files deployed.
com.sap.portal.system/applications	Lists applications loaded in the repository.
com.sap.portal.system/configuration	Lists the configuration for the applications.

Local Deployment

Immediately after an application is uploaded to the application repository, a copy is deployed locally to each node in order to improve performance by providing fast access to resources and avoiding extra calls to the repository.

The applications on each node are, in essence, only cached copies of the applications that are stored in the repository. The copies on each node should not be modified directly.