Frames and internal frames embedded inside HTA (HTML Application ) files cannot modify data outside of their respective frames using JavaScript, unless the application attribute is set to yes in the HTML tag that created the frame/internal frame.

Below is an example of markup that creates an internal frame that has full read/write access to data in its parent's window:

Below is an example of markup that creates a frameset with two frames, both of which have full read/write access to their parent window, and each other's frames: