Printing from external applications

Hi all,

I'm in the process of converting from AutoCAD to Microstation. I have an external VB program that opens .dwg files and creates pdf files from them and adds them to other pdf files to create a document we then supply to our customers. Currently I'm using dde channels to communicate with AutoCAD to do this. Is there any way I can do something similiar with Microstation .dgn files?

Thanks,

Dave