If I remember correctly, you can change the prefix designation. You should register your prefix with Autodesk to be sure noone else uses that prefix and thus causes your programming to have issues with other programming. i.e. if there is already a program using ads_myline and you compile this code, there would be competing programming for the exported function and thus one of the programs would not operate properly. I think it has to do maily with object ownership, but right now my memory is failing me.