Javascript window.open returns an object that points to the newly open window. this is how you can make fake window objects to fool some page reloads :
Function dummyWindow will return a Window object whose reload doesn’t do anything

function _location(){
this.reload=_reload;
function _reload(){
return;
}
}
function dummyWindow(){
this.location = new _location();
}

Its a Hack but usefull in some scenarios