[C# MicroStation CONNECT update 15] How does MicroStation handle opening DWG files?

When opening a DWG file within MicroStation how does it happen? Does the DWG get converted into a DGN file when it is opened, or does the DWG get natively processed through RealDWG? 

The reason for asking, I am wanting to access the title block tags/attributes of a DWG but I am not sure if I should access them the same way as a DGN, and go through the model then scan for elements?