The Microsoft PowerPoint Broadcast Service makes it easy for PowerPoint 2010 users to share a presentation on the fly with anyone, anywhere, over the web.
Just send a link, and in one click everyone you invite will be watching a synchronized view of youy slideshow in their browser, even if they don’t have PowerPoint 2010 installed.
To broadcast your slides to an audience, follow the directions below.
Step 1 : If you don’t have PowerPoint 2010 installed, download the Office 2010 today.
Step 2 : To start a broadcast from PowerPoint 2010, on the Slide Show tab, click Broadcast Slide Show.
U will get the Broadcast window just like the example below.
Step 3 : Click on Start Broadcast (It will connect to the PowerPoint Broadcast service)
After that the Sign in box will appear. Sign in with your Windows Live ID. (If you use Hotmail Live messenger or Xbox LIVE.
PowerPoint will provide a public link that you can send to remote attendees. Anyone who receives a link to the broadcast may watch it. Keep in mind that if an attendee forwards the link to someone else, that person can also use the link to view your broadcast.
You can invite more attendees with send Invite button.
To view a broadcast, just open the Broadcast link (All you need is the latest version of Internet Explorer, Firefox, or Safari for Mac.)
Source : WinSpark.net