Let us suppose that Foo contains a mailing list called theList.
We have some cards in Goo that we want to include in theList. If we include
them in theList. theList is updated but now we have some new cards that
magically appear in Foo. Why don't we just have a pointer to the cards in Goo?
Situation:
Imagine we have two address books:
addrbook 1 --> Foo
addrbook 2 --> Goo
Let us suppose that Foo contains a mailing list called theList.
We have some cards in Goo that we want to include in theList. If we include
them in theList. theList is updated but now we have some new cards that
magically appear in Foo. Why don't we just have a pointer to the cards in Goo?