In Python: Put qubtree.dll in c:\python23 Put _qubtree.pyd and qubtree.py in c:\python23\site-packages >>> import qubtree In C++: Use the header files: QUB_QTR_Impl.h QUB_Tree.h and the import library: qubtree.lib and put qubtree.dll where it can be found In Delphi: Use the unit QUB_Node.pas with qubtree.dll