apexDesignerAppService use

Technical Questions
1

I understand that the apexDesignerAppService is available for executing server side behavior…I see an apexApp.service.ts under …/…/shared/services/apex-app.service.ts in my project.
Can you provide a few examples of how to use this service?

2

here’s an example.
This code runs in a Service, calling the apexAppService to call a server-side App Behavior defined in the app, and storing the returned value in the Service (so it doesn’t have to call the App Behavior again.
this.runtimeEnvironment = await this.apexAppService.getRuntimeEnvironment();