[Gimp-developer] How Does One Call An Existing PDB Procedure From A C Plug-in?

[stormy franchise5000 com]

How do I access existing PDB procedures from a C plug-in? I'm very
familiar with how this is done in Scheme & Python. I'm confused on how
this is accomplished in C.

Can someone explain how this is done and/or provide a link to an example
of a C plug-in that calls an existing procedure in the PDB?

Many Thanks!