Privilege Seperation many examples in the openbsd tree sshd, bgpd, ntpd, ospfd, dhclient, dvrmpd, spamd (kinda), isakmpd, pflogd, hostapd, ospf6d, relayd, ripd, snmpd, syslogd, mopd, bind, tmux, ypldap, ldpd exactly two examples outside OpenBSD we know of... qmail and postfix help to increase that number! best example to learn from: ntpd. reasonably simple and done well