Pass values/data across GWT modules

I have two GWT modules with its own entry point, ModuleA and ModuleB. I am using Window.assign() to move from ModuleA to ModuleB. One Variable value is set in ModuleA. How to access the same value from ModuleB? I am looking for a way to save value in variable declared in ModuleA and access the same variable value from ModuleB.

Thanks in advance.

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