While this is superior to just “xhost +”, you are still trusting a lot of people you don’t know with the security of your desktop. A variant that was frequently employed in the early 1990s was to run “ xhost +acs” which will allow any user on the system “acs” to display to your X-Windows server. You should never use “ xhost +“ You never want to trust the entire planet. If you are using the console of a Unix or Linux desktop system (where you are seated in front of a monitor directly connected to the Unix system), and you run the command “ xhost +” you will allow anyone, anywhere to display things to your X-Windows server. Xhost: The xhost program on Unix and Linux sets global policy for the X-server. 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. X-Windows Client: The computer system that is running code that wants to display a graphical user interface. 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 Server: The X-Windows Server runs on the computer that has the monitor on which a graphical user interface will be displayed. An understanding of how these methods work and the related terminology will help you to secure your display and keep it secure. The X-Windows System Version 11 has two primary means of controlling access, xhost and xauth.

X11 for windows