It has optional support for active notifications. So on devices that have such notifications (e.g. Moto X) it can set a notification on the active display, thus allowing you to see who you are logged in as without touching the device.
It was designed to meet a single (very, very, very) specific need. If however you can think of something else useful for the app to do (maybe something that will help prevent multi user discombobulation and/or help achieve notification nirvana!), please don't hesitate to get in touch: firstname.lastname@example.org.
- Notification icons courtesy icons8.com.