Differences in controlling daemons & applications

Question

With respect to this excellent post:

What's the difference between nohup and a daemon?

I would like to ask the following:

After launching an applicat

Answer 1

# /etc/rc.d/daemon-name {start|stop|restart|status|...}

it is not a querying to the daemons directly. It is launching scripts by standart interface and these scripts in turn operate with daemon process by PID and signals. This scripts are creating during installation process of daemons-programs.