Hello people, my name is Edisson Savio and I am interested in implementing DLL libraries in my code. I work with simulation of numerical methods applied to reentry physical problems. I have implemented my actual code in PASCAL language using Class variables as start point. I have sucess in such implementation. Now, I am interested in using DLL libraries and after a research in this topic, my unique idea was based on the work of Marco Cantù in "Bible Delphi 3" and I have implemented in such way. I have created the base unit and the implementation unity, as well as the DLL routine. When I put this one to run, my code doesn´t execute the first implementated routine. I would like to know if there is someone who can help me in this task? I wait for your help, best regards, Edisson Sávio.