I don't know if I understood well your question, but apart from that, you shall use IP multicast in a router if the senders and receivers of the Multicast are connected in different LAN. So you have to configure some layer 3 Multicast protocol like the PIM.
However, if the all senders and receivers are located in same LAN, you do not need configure Multicast in a Router, but if you want to optimize (what its recommended) the Multicast traffic in your LAN, you can configure layer 2 Multicast protocol like CGMP (include the router) or IGMP Snooping.
The WWW cannot leverage multicast except via mbone. You can however tunnel multicast traffic in a unicast stream to use the internet as transport which can then be unencapsulated at the far end and multicast across a LAN. The Cisco IPTV product supports this function for example using a feature called 'SmallCast'
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Please find the attached HTML document, download and open it on your PC.
This provides an easy to use form where you simply answer a few
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