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Read "and" Write Access

I have a control that is bound to a shared variable with read and write access. When I build and execute a VI containing the bound variable, the shared variable changes value (in this case to false) instead of maintaining the value it had before the VI with the bound variable was called (true). Is this because the default setting of the control (false) writes to the shared variable? I would have expected the bound variable to take the value of the shared variable. How exactly does read "and" write access work?  

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Since your description makes no sense, it would help if you could create and attach a small example VI. Thanks!

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