[Icecast] Questions about ICAST and Web Development

[Me Myself and I]

-HOW does ICECAST stream content?  
-Can it stream sound being spoken live over a microphone?
-Can this live audio be streamed in an MP3 format?
-Can this audio be streamed to HTTP Web browsers (including XMLHttpRequest techniques)?
-How does an HTML file being served by Apache/Tomcat best set up
 so that the browser can correctly accept sound from ICECAST? 		 	   		  
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