For clarification:
As each of the applications in a PLC project has their own memory area, it is not possible to access data that is declared in the other one
Only one application can the set to be actively update IOs, same for the data layer realtime area
A global variable list set up in the POU area gets instanced by each application
Possible data exchange:
Create data in the data layer with one application using the symbol configuration and access them via read/write function blocks out of CXA_DataLayer
Create an shared memory with one application and access it via the other
Create network variables with one application and access it via the other
Use any other TCP based protocol to exchange data, e.g. OPC-UA, sockets, UDP...
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