I answer myself.
You must install PlanG on the server computer (P3D), generate the database, and then copy the directory "Plan-G Files" created on the server PC into Documents, in the same place on the client PC. And there PlanG activates. Impec!
You must install PlanG on the server computer (P3D), generate the database, and then copy the directory "Plan-G Files" created on the server PC into Documents, in the same place on the client PC. And there PlanG activates. Impec!