For streaming you'd need Charcoalgrey's web interface (there may be other ways to stream, but that's the one I know).
Actually, CharcoalGray's web interface merely puts a pretty face Hijack's built-in streaming feature. To stream from the empeg directly from Hijack, the following URL is used:

http://empeg/?fid=101&ext=.html

(Where "empeg" is the IP address or DNS name of your empeg)
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Tony Fabris