New webpage closes previous page

I'm working with a hospital where we are implementing a web-application that is triggered from their own hospital information system (HIS).
The way the app works is that in their HIS, they select a patient and call the web-app with the patientId in the url.

Regarding patient safety, they want only one of those tabs open at the same time.
So if a second patient-tab is opened, the first one should be closed ..

Is this possible? And if it is, how?