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Open two forms at startup in c++ builder

Without seeing your actual code, it is hard to say, but chances are that Form3 has simply not been created yet when you are calling Form3->Show(). You are getting an error at a memory address close to 0, which is a good indication that you are likely accessing a NULL pointer.

You don't need to call Show() unless you want more control over WHEN the Forms are shown. You could simply set their Visible property to true at design-time and let the VCL show them for you when Application->Run() is called to start the message loop.

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