Window Hopper is a Microsoft PowerToys feature that lets users switch faster between windows inside the same application, using an Alt+Tab-style workflow. It is a usability tool, not a security control, and its main purpose is to reduce friction when an app has many open documents, dialogs, or panes.
In cyber security, features like this matter because they shape user attention. When people rely on keyboard shortcuts and muscle memory, they may move quickly through prompts, overlapping windows, or login screens without fully inspecting what changed. Attackers can exploit that human habit with fake dialogs, window spoofing, or prompt-heavy social engineering. Defenders also care about the same behavior: keeping users oriented can reduce mistakes, help them notice suspicious window titles or unexpected UI changes, and improve the chances that a warning is seen before it is dismissed.