yes, Would be rather big in filesize too (if that isn't what you mean)
But alls you would have to do is make copies of he login window, main window, and chat window. (Maybe a few more) and where it is text that can be replaced just make textboxes with the textvalue of that text. And for images Picture Boxes and set a on click code open an open file dialog and change the image. Also generate the needed code at the same time