11-19-2008
If you open two browsers, they'd be two children of the same parent, not one as the parent of the other.
There's also more layers than init -> user application -> children, though that's enough for examples. Init creates the window server which creates the login manager which creates everything you run; or for a shell, init creates the login shell which creates your processes.
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INIT(8) System Manager's Manual INIT(8)
NAME
init - initialize machine upon booting
SYNOPSIS
/$cputype/init [ -ctm ] [ command ... ]
DESCRIPTION
Init initializes the machine: it establishes the name space (see namespace(4) and newns in auth(2)), and environment (see env(3)) and
starts a shell (rc(1)) on the console. If a command is supplied, that is run instead of the shell. On a CPU server the invoked shell runs
cpurc(8) before accepting commands on the console; on a terminal, it runs termrc and then the user's profile. Options -t (terminal) and -c
(CPU) force the behavior to correspond to the specified service class. Otherwise init uses the value of the environment variable $service
to decide the service class.
Init sets environment variables $service (either to the incoming value or according to -t or -c), $objtype (to the value of $cputype),
$user (to the contents of #c/user), and $timezone (to the contents of /adm/timezone/local).
With option -m init starts only an interactive shell regardless of the command or service class.
On a CPU server, init requires the machine's password to be supplied before starting rc on the console.
Init is invoked by boot(8), which sets the arguments as appropriate.
SOURCE
/sys/src/cmd/init.c
SEE ALSO
rc(1), auth(2), boot(8)
INIT(8)