Factory Design Pattern

http://www.oodesign.com/factory-pattern.html
http://www.javaworld.com.tw/jute/post/view?bid=44&id=24993&sty=1&tpg=1&age=0

So, different factory will produce different product with same product interface.
The factory instance need to return the correct product instance.

But in the end, client will control factory or product?