API Reference > imodeljs-common > iModels > OpenDbKey OpenDbKey Interface A key used to identify an opened IModelDb between the frontend and backend for Rpc and Ipc communications. Keys must be unique - that is there can never be two IModelDbs opened with the same key at any given time. If no key is supplied in a call to open an IModelDb, one is generated and returned. It is only necessary to supply a key if you have some reason to assign a specific value to identify an IModelDb. If you don't supply the key, you must use the returned value for Rpc and Ipc communications. Properties Name Type Description key undefined | string Defined in core/common/src/IModel.ts Line 132 Last Updated: 12 June, 2024