The X-Windows System Version 11 has two primary means of
controlling access, xhost and xauth.  An understanding of how
these methods work and the related terminology will help you to
secure your display and keep it secure.   X-Windows Server: The
X-Windows Server runs on the computer that has the monitor on
which a graphical user interface will be displayed. The
X-Windows server is usually incorporated into Unix and Linux
desktop installations, but may be added to Microsoft Windows PCs
using programs such as Xwin32 or Exceed.  X-Windows Client: The
computer system that is running code that wants to display a
graphical user interface.  In some cases the client and server
may be the same system, but if you’re X-Windows server is
running on a Microsoft Windows system, the client is generally
the Unix or Linux server you are connecting to and running
MatLab or Xterm(inal) or similar programs on.  xhost: The xhost
program on Unix and Linux sets global policy for the X-server.
 If you are using the console of a Uni