This exclusive mode is not directly available to APIs other than WASAPI. However, the audio system might automatically uses exclusive mode if the application attempts to use an encoded format (and if the output supports the format, and if the Sound control panel settings allow it). Frank Yerrace Microsoft Corporation This posting is provided "AS IS" with no warranties, and confers no rights. From: wdmaudiodev-bounce@xxxxxxxxxxxxx [mailto:wdmaudiodev-bounce@xxxxxxxxxxxxx] On Behalf Of T C Sent: Wednesday, June 27, 2007 1:23 AM To: wdmaudiodev@xxxxxxxxxxxxx Subject: [wdmaudiodev] Fwd: Exclusive mode in Vista Dear all, I have a question about exclusive mode in Vista. In Vista, audio could be streaming in exclusive mode thru IAudioClient. Is it the only to use Core Audio API to enable exclusive mode? Or it could be enabled through higher-level API, such as DirectSound or even we could enabled it through Directshow audio renderer's interface? I am wondering if exclusive mode could be enabled through IDirectSound's SetCooperativeLevel(hwnd, DSSCL_WRITEPRIMARY); ? Thanks for your kind help. Regards, Cyndi