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Property PCD.Home 
This variable value defines the location of the PCD configuration file. In a clustered environment, this should be a central location (i.e. shared between all server nodes of a cluster) in order to have a common configuration for the whole cluster.
The value of PCD.Home is defined by default by the J2EE Engine. A shared global directory that is used by all the applications of the J2EE Engine is used. The global directory for the PCD resides at /usr/sap/<Instance>/sys/global/pcd.
This directory also contains the configuration file PCDStartup.Properties.
The value of PCD.Home can be overridden by a system property.