When an application server is stopped, they all shut down together.
This means that not all application servers will provide the full range of services.
But in practice, the services are distributed across more than one application server.
A computer running several software components is often called an application server.
Each application server contains a set of services used to run the R/3 system.
Not practical, only one application server is needed to run an R/3 system.
When an application server is started, these executables all start at the same time.
It passes requests from one application server to another within the system.
A language that would be a suitable fit with the desire for a service based application server was another driving force.
The subscriber has to explicitly place a call to the application server.