Dell S510 Interactive Projector - Manual (Page 95)

Using Your Projector 95
Using the Audio Projection
9 You are now logged into the Dell Projector Connection Manager.
Click the "Play" button in the application to starting the LAN or
wireless audio projection.
10 Click the "Audio Projection" button in the application to toggle audio
projection On/Off.
NOTE: Audio projection function needs install extra driver only in
Windows XP. If your computer does not have the driver installed, a
pop-up message will appear on-screen prompting you to install the
required driver. You can download the "Audio Projection Driver" from
the Dell Support site at dell.com/support.