Hello Andrea, If my contest DLL is placed in c:\ham\Programs\UrDxDigital.dll then type regsvr32 c:\ham\Programs\UrDxDigital.dll to add the dll to the WL list and type regsvr32 /u c:\ham\Programs\UrDxDigital.dll to remove it. 73! -- Best regards, Nick mailto:nf at tav.kiev.ua