Consider adding an option to attach to an existing window.
* Need to consider what to do if window doesn't exist
* Will this be a title or url? (two different options?)
* I'm inclined to make it a substring and thus not worry about string vs regexp.
Description
Consider adding an option to attach to an existing window.
* Need to consider what to do if window doesn't exist
* Will this be a title or url? (two different options?)
* I'm inclined to make it a substring and thus not worry about string vs regexp.