The invention discloses a system and method for integrating user interfaces (UI) within an application. The invention can be configured to display an UI of a second application within a first application in a manner that the user cannot identify that the second application's UI is displayed on top of a reference window within the first application. The invention can be configured to identify a reference window that is to be replaced by a replacement window of the second application, monitor the reference window, create the replacement window, and align the replacement window over top of the reference window.