I was reading anonymous pipes on MSDN. they say: "The process can also duplicate a pipe handle using the DuplicateHandle function and send it to an unrelated process using some form of interprocess communication, such as DDE or shared memory."
I was not convinced with the statement. As we already know, pipes are useful to communicate between parent child and the duplicate handle refers to the same object as the original handle. http://msdn.microsoft.com/en-us/library/windows/desktop/aa365141%28v=vs.85%29.aspx