not (yet) / never implemented things:

- command line options for init.app, getty.app, login.app or gemsh.app
- total system shutdown (call reboot if you need it)
- writing to the syslog daemon
- password aging
- evaluation of NIS entries
- different run levels of init or evaluation of /etc/inittab
- setting base environment variables acc. to /etc/default/init
- single user mode
- writing to /etc/ttys
- writing to /var/adm/utmp (set a link from /etc/utmp if you need it)
- ttytab secure-/rootlogin()- check
