how the narrator in computer[control panel] for blind /visually impared users
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Answer:
Narrator is a useful piece of built-in accessibility software. Narrator is included with every copy of Microsoft Windows, providing a measure of access to Windows without the need to install additional software as long as the computer in use includes a sound card and speakers or headphones. Windows 2000 was the first Microsoft operating system released with some degree of accessibility for the blind built in, permitting a blind person to walk up to any such computer and make some use of it immediately.
Narrator can assist a blind person in installing a full-function screen reader, assisting the user until their screen reader of choice is up and running. Because Narrator is a lightweight screen reader that requires minimal "hooks" into the operating system, Narrator can provide speech when a full-function screen reader might be unable to do so, such as during the process of updating hardware drivers.