Multilibrary project

[Peppy]

I have a confusing question: How to build a multilibrary (modular) project? Can I build something similar like C# Windows Forms Application ? For example:

Project.exe
Project.Core.dll
Project.Services.dll
Project.Resources.dll
...

Project.exe
Project.Core.dll
Project.Services.dll
Project.Resources.dll
...

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I don't think that plug-ins will be the best solution or yes? I have tried this:

// Project.exe
int main(...) 
{
   QApplication
    // Load Core library and get main window instance
}

// Project.exe
int main(...) 
{
   QApplication
    // Load Core library and get main window instance
}

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But this example won't work because it won't draw any window. I very thanks for all responses or solutions.