Microsoft COM (Component Object Model) technology in the Microsoft Windows-family of Operating Systems enables software components to communicate.
Writing 32/64bit COM objects with the Lazarus shipped library is not very comfortable, but with the BTComObj.pas unit Lazarus devopers can build COM Objects as easy like in Delphi.
French
Les objets COM permettent de contrôler les applications COM de Windows. Voici une librairie Lazarus pour Windows permettant de les utiliser.