Real Time Visitor Chat Pop Up? [closed]

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Are there any PHP/JS based tools that allow me to intitiate a chat invitation to a live visitor on a site, like they do on Bank sites and Salesforce?

EDIT: LiveZilla could work, but I'm a Mac user, so I'd like to not have to run it via a VM. Is there any purely web based or mac-based solution?

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livezilla: http://www.livezilla.net/home/en/

I believe this would do what you want.

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Try LiveZilla:

http://www.livezilla.net/home/en/

Here's a detailed list of features:

http://www.livezilla.net/features/en/

and some screenshots:

http://www.livezilla.net/screenshots/en/