Access page fragment from a page or vice versa

How can you access (get and set) the components of page fragment from a page?
I have a page fragment with a drop down box, which is shared across many pages. Now the value of the drop down list (in the page fragment) needs to changed based on the table columns of the page. I can easily do that if the drop down is on the same page as the table component, but I can't figure out how to do this if drop down is on a page fragment and the table is on a page. In other words, how do we make the page "see" its page fragment programmatically or vice versa? When you use this.xxxx, you only get access to page components and it does not include the comonents of the page fragmant which is embedded in the page.
Thanks
Message was edited by:
Sabir

What happens if a user were to have multiple browser windows open under the same session?
Let's say I had a header like this example and I disabled some of the links on given pages. If a user had 2 pages open, and both has an instance of this header page fragment being rendered, which page's header would have its link disabled? Would it be both or would it somehow know to only affect the fragment within the page that's calling .disabled(true)?

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