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Difference between UNIX domain STREAM and DATAGRAM sockets?

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http://stackoverflow.com – This question is NOT for the difference between STREAM type and DATAGRAM type INTERNET sockets. I know that STREAM sockets use TCP, Datagram sockets use UDP and all the TCP,UDP stuff, packets arriving in order, ACK, NACK etc. I understand the importance of these over internet. Q1) When I create a UNIX domain socket which is a local socket, how would it matter if the socket is STREAM socket or DATAGRAM socket. This type of socket would write the data to the socket file, would the protocol matter in this case since I am not transmitting data over a network? Is there any chance of data loss in t (HowTos)