MS Power Point
To save a presentation you

select File, Save from the menu
click the saver button on the formatting toolbar
click save on the windows start button
press Ctrl + F5

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MS Power Point
What is the use of 'Hide Slide' option?

to hide the selected slides during Deleting
to hide the selected slides during Presentation
to hide the selected slides during Printing
to hide the selected slides during Editing

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