System properties are specific to a system or a platform in which you create your app.
The value associated with the variable at that particular time. For example, bh.systsem.environment returns information about the current environment that the app is built on.
The following are the pre-defined system services that you can use across your apps:
You can access the system properties from any flow by using bh.system.<property>. For example, if you have a service which requires Neutrinos Art authentication, then you can drag and drop a Script node to your flow, and use the bh.system.loginService.login() method.