UDPSocket.JoinMulticast Group
From Xojo Documentation
Method
UDPSocket.JoinMulticast Group(Group as String) As Boolean
Supported for all project types and targets.
Supported for all project types and targets.
Attempts to join the specified multicast group.
Returns a Boolean. If the socket successfully joined, it returns True. You can join as many multicast groups as you'd like. The Group parameter specifies a ClassD IP address in the range: 224.0.0.0 to 239.255.255.255.