Is "chat with bing" chatting with a real person? and if it is, who is it?

No.

Explanation:

While the it is voiced by a person (same as Google, Alexa, etc.), the program itself is well, a program, with the ability of deep learning, or to learn from people as well as any information given to it.

All in all, it's just a program given a voice and learning capabilities.

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yes, it is other users

answer; by the southern association of colleges and schools commissions(institutional accreditation)

a macro is a tool that allows you to automate tasks and add functionality to your forms, reports, and controls. for example, if you add a command button to a form, you associate the button's onclick event to a macro, and the macro contains the commands that you want the button to perform each time it is clicked.