ActiveX controls that you create need to be registered on the deployment computer before use. Installation programs such as InstallAware Express automate this registration process. To manually register an ActiveX control, choose RunActiveX Server in the IDE, use the TRegSvr demo application in \Bin or use the Microsoft utility REGSRV32.EXE (not included with Windows 9x versions). 

DLLs that support an ActiveX control also need to be distributed with an application.