Sometimes you want to pass a function around from script to script as a string containing the function name (well maybe not, but I have some legacy code that does require this)
So if you have a function called doSomething() and you want to call it from another page, but you’ve passed it like so:
So what I’m saying is the function will be placed into the Window object, so you can call it :
And it obviously extends to the window.opener object.
I’m sure there are better ways, but this is handy to know I think.