People who work on intranet often have the same IP address, operating system, and browser configuration. Piwik PRO uses this information to form a session ID and recognize a visitor. So when people have the same session ID, they may be all seen as one visitor.
But Piwik PRO uses another mechanism to recognize a visitor — Visitor ID. It is the ID stored in a cookie set in the visitor’s browser.
So when you want to precisely count visitors on intranet, you can turn off using a session ID and use only cookies to recognize visitors. To turn off a session ID, follow these guidelines.