Hello, I've added a device specific node to my driver's topology, I can enumerate it and send IOCTL to it,everything works perfectly. The only problem, is that I need to set up a mechanism that allows change notifications, so, if there are two applications , if one changes the property value,the other application will be notified(Like when you change the volume under SNDVOL32). Must I set up an Event in my driver(AddEventToEventList,GenerateEventList...)?Or are there another solutions? Thank you in Advance. Best regards. Nassim Bouayad-Agha ****************** WDMAUDIODEV addresses: Post message: mailto:wdmaudiodev@xxxxxxxxxxxxx Subscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=subscribe Unsubscribe: mailto:wdmaudiodev-request@xxxxxxxxxxxxx?subject=unsubscribe Moderator: mailto:wdmaudiodev-moderators@xxxxxxxxxxxxx URL to WDMAUDIODEV page: http://www.wdmaudiodev.de/