We have a USB 2.0 Video/Audio product. It has seperate drivers for Video and Audio which we developed (It does not use Microsoft's USBAUDIO.SYS - it was developed before the full USB 2.0 audio class spec was available) The Audio driver is a Port Class mini-driver which works fine for most of our device configurations but on some configurations the audio driver needs to communicate with the video driver. (Otherwise I have to duplicate a lot of complex I2C functionality in the audio driver) Is this possible? If so any advice on how it can be done. ( I am just getting back into driver development so this may be a very basic problem but so far I haven't found a solution) Steve Thorpe ****************** 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/