This is an extranet on which all the documents regarding the production of a large website are placed. Each user has their own password and can access certain information depending on what their role is. This centralizes all the documents, project schedules, remarks, etc., relevant to the site. It is used for the duration of the project.

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Note added at 4 hrs (2006-01-25 15:00:55 GMT)
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Wikipedia definition:
An extranet is a private network that uses Internet protocols, network connectivity, and possibly the public telecommunication system to securely share part of a business's information or operations with suppliers, vendors, partners, customers or other businesses. An extranet can be viewed as part of a company's Intranet that is extended to users outside the company (eg: normally over the Internet). It has also been described as a "state of mind" in which the Internet is perceived as a way to do business with other companies as well as to sell products to customers.

In this instance the client (outside the company) is approving production work of a web design company, according to a specific schedule. The client can be just one person or a number of partners. I have already worked with such an extranet. An external graphics design company can also be involved as can one or many translators, depending on the complexity of the web site.