PPW method

The so-called "Orientation Windows" is the U layer as shown on the left, the relative position of the magenta facelets to each other.

If "Orientation Windows" go with 5 pairs as shown on the right, then the 3 corners that are not in the 5 pairs, and if the 5 pairs only do Interchanging PAIRs Move, the color of the same corner on the Orientation Windows will not change.

Demonstration

Focus on the red facelet of the animation on the left to feel the above explanation