How can I check for an open URL in another window?

Question

This is a follow up to my last question Open a window if the window does not already exist Essentially, I am now keeping a list of all the window references that have been o

Answer 1

@annakata (and even if you stored them, you wouldn't have permission to close them any more)

Not true. If you have the name of the window, you can use window.open to reestablish a link to the window even if the opener was closed and reopened. For example:

Click me first, close and open this window, then
click me to close the other window