This is the home for the FHIR test server operated by University Health Network. This server (and the testing application you are currently using to access it) is entirely built using HAPI-FHIR, a 100% open-source Java implementation of the FHIR specification.
Here are some things you might wish to try:
This is not a production server! Do not store any information here that contains personal health information or any other confidential information. This server will be regularly purged and reloaded with fixed test data.