Hello Dave I've found in MSDN .NET 2003 this article 'Browser Helper Objects: The Browser the Way You Want It' with code, but i think is the same. If you want, in ftp://ftp.infomedia.it/pub/ComputerProgramming/Listati/cp70-79/cp76/Cp76Sorg/ there is a zip file (userint.zip) with code for a simple BHO Best regards Luca