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On Unix platforms, the c-treeRTG server shares a directory with the c-treeRTG clients when they communicate via the shared memory protocol. It is possible to configure the c-treeRTG server to change the default shared memory directory with configuration keyword SHMEM_DIRECTORY. Using different shared memory directories allows running multiple c-treeRTG servers with the same name on the same machine. To configure the c-treeRTG clients to set the shared memory directory, it is necessary to set the c-tree global variable ctshmemdir.
This revision implements a new <instance ctshmemdir> attribute to configure the shared memory directory for the <instance> by setting the c-tree global variable ctshmemdir.
The <instance ctshmemdir> is ignored under Windows as it is meaningful only for Unix platforms.
