> My next problem is this - MCAST_JOIN_GROUP requires me to pass a GROUP_REQ 
> structure which contains the following member:
> gr_interface
> The interface index of the local interface on which the multicast group 
> should be joined or dropped.
> Is this something I can retrieve using ICS or do I have to call 
> GetAdaptersAddresses, parse the output and find the appropriate network 
> interface?

You have to use IpHelper functions like GetAdaptersAddresses.

The author of the freeware multi-tier middleware MidWare
The author of the freeware Internet Component Suite (ICS)

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