The frontend of an app does not open a briefcase directly. Instead, it remotely "connects" to a briefcase that is managed by a backend.
IModelConnection is the main class used by frontends to access iModels. It is a handy wrapper around IModelReadRpcInterface and IModelWriteRpcInterface. It makes it easy for frontend code to get access to a particular iModel and then read and write element and model properties.
Last Updated: 20 September, 2019