HOW TO CONTROL WHAT SYSTEMS CAN HAVE A REMOTE DISPLAY TO YOUR MACHINE
(Controlling which machines sees your machine in their chooser list)

At the dtlogin screen, by using the dtchooser screen,  a user can have
a remote Xserver display to another machine. To limit only certain
machines to have access for a remote Xserver display:

First, copy /usr/dt/config/Xaccess to /etc/dt/config/Xaccess.
If necessary, create the /etc/dt/config directory and mimic the
permissions, owner and group of the /usr/dt/config directory.

Then, modify the file /etc/dt/config/Xaccess as follows:

This is what it currently looks like by default:
#   Entries...

*                       # grant service to all remote displays

Change it to the following:

#   Entries...

# *                       # grant service to all remote displays

host_a host_b             # grant service to these displays

NOTE: You should not list the local name of the machine. Only the machines
that you want access for remote displays should be added.  The list of
hostnames
should be separated by spaces.

When finished, you can restart the Xserver or reboot the machine for the
changes to take effect

To restart the Xserver, telnet or rlogin to the server to stop and restart
dtlogin:

# /etc/rc2.d/S99dtlogin stop
# /etc/rc2.d/S99dtlogin start