Why does the CLX.Sentinel browser window blink?

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Why does the CLX.Sentinel browser window blink?

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The frame of the browser window and the toolbar blinks if another window is on top of the CLX.Sentinel browser window. This happens when any part of a window (e.g. Explorer, Firefox, e-mail program, etc.) overlays the CLX.Sentinel browser window. You can easily bring the CLX.Sentinel browser window back to the top by using the Alt-Tab key combination. The blinking of the CLX.Sentinel browser is a useful feature that informs users of an overlying window, which can be part of acyber attack. In these attacks, a malware program opens an invisible window (an overlay) on top of your browser and records/changes sensitive transaction data such as user names/passwords, PINs, account information, payment entries, etc.

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