The caregiver taps the sticker by Demo Resident's door at the morning round. The ledger records the visit.
On a walk in the park, the resident feels faint. A passer-by with an Android phone taps it on the card on the resident's lanyard.
The phone shows the text: blood group, medication, allergies and the home's phone number. No app, no signal needed.
A family visitor arrives on a pass booked by the office and is announced to the duty nurse.
The night shift exports the day's rounds from the ledger for the handover.