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There is only a single set of system properties, and that is accessible to all parts of an application (unless you want to fiddle with security managers, and introduce specific Permission objects for some parts of the code).
Maybe you can create a separate Properties object, and pass that to those parts of the code that are allowed to access it?
What is the problem you're trying to solve by doing this?
Ping & DNS - updated with new look and Ping home screen widget