JQuery :: Accessing Window DOM Through Window Object

Goal: From window A, I want to manipulate the DOM of window B, where window B is the result of calling window.open(). My attempts are shown below, but Window B is never updated.
winRef = window.open("","Window B");
Try 1:
$(winRef).find("body").append("<div id=container>mr container</div>");
Try 2:
$(winRef).find("body").html("<div id=container>mr container</div>");
Try 3:
$(winRef.document.body).append("<div id=container>mr container</
div>");
Try 4:
$(winRef.document.body).html("<div id=container>mr container</div>");
The jQuery Core doc [URL] claims that it can wrap a window object. Browser is FF2.0