This technical note will provide more insight on the changes between 4D releases and the difference and significance between the versions and build numbers. The code changes between different builds of 4D can cause errors and unexpected behaviors may occur when running mismatched builds between clients and servers. While 4D has a mechanism to prevent connection of mismatching Clients and Server, it isn't strongly enforced for builds of the same version. This Technical Note will also provide a technique and methods to address this problem.

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