@Attiq Thank you!
I do not know how exactly nurse call system will work and how IOT BROKER VIS will be looking. However you can create any type of custom widget for your use case. To know more about custom widgets kindly have a look on both pages, http://forum.mycontroller.org/topic/37/custom-widget/2 and http://forum.mycontroller.org/topic/20/widget-sensor-custom-buttons
hope those ^^ links might help you.