Building Link as a Join??

The very first expression that any Siebelized person would have after reading the title of this post would be, "hey, what is that?? Join and Link are two different objects in Siebel. Join used for building 1-1 and M-1 relationship and link is being used for building 1-M and M-M relationship. So how come you can build a link via join??".......I knowwww and I am there with you what you just thought