|Index||-||FAQ - Cart Help Buttons - Cart Settings - 8. Advanced Settings|
Websites that are using frames may need to break out of frames during check out. Otherwise, your customers may not realize that they are using a secure shopping cart.
If you remain in frames it may not display the secure lock because the cart is inside your frameset, and your frameset may not be secure.
To ensure that your customers can easily identify that the cart is secure you may wish to check this to allow the shopping cart to use its own browser window, and not stay in your frameset.