http://cypherpunk-handbook.i2p/articles/openbsd.html
OpenBSD has its own soft
fork of the X.Org server called Xenocara, designed to enhance security.
In addition, Xorg's internet access is blocked by default by the
firewall pf. Xenodm is a simplified fork of xdm: lightweight, more secure, and
stripped of XDMCP support because of many security vulnerabilities.