Note: By default, Grasshopper cannot access the internal parameters of ARCHICAD Library Parts - they are grayed out on the interface. To allow Grasshopper to access the Library Part’s internal parameters, you must modify its program code.
The quotation is originally written in PDf documentation of GS-AC connection. What does "modifying its program code" means? How can I do this and reach its parameters? Because I want to modify object parameters at GS.