can we name the root window?

My case is:

opened a new page from root window (using UI.getCurrent().getPage().open(url, windowName)), and then I want to go back to the old window through a link in the new page. But if I don’t know the name of the old window, I can’t achieve that. So can we give the root window a name?

Also what’s the best way to get the root window? I know there is a method: UI.getCurrent().getWindows(), but is this a good approach?

Thank you!