I want to get the references of all already opened child windows. is there any way? I am not using child = window.open(....) just using window.open(....)<
I don't believe you can, unless you know the windows' names, which I'm guessing you don't. (If you know their names, you can use window.open("", "name") to get a reference to them.)
The better option is, of course, to remember the reference returned from window.open in the first place — but you know that. :-)