Sharing Database Connection Across DLL

I'm working on Delphi C/S with Interbase NT and would like to create a
centralized TDataModule and compile it as DLL so that all sub projects can
access it by making DLL calls (at least sharing the TDatabase connection).
But how to go about it. Currently I have to include this TDataModule in
every single project.

Thanks in advance.

Edward Terng