If I use TWSocket in UDP mode, do I require 2 TWSocket components (1 to Send
and 1 to listen)

is this correct ??    or can 1 TWSocket be used to send and listen to UDP
data ????

Only one is enough.
The one which listen may also send UDP datagrams to a specific host using SendTo method.

Also what is the property that tells you what the IP address the UDP packet
came from ??

Use ReceiveFrom method to receive a UDP datagram and the sender informations (IP/Port)

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

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