diff --git a/README.md b/README.md
index 8075354..ab1c7d8 100644
--- a/README.md
+++ b/README.md
@@ -68,6 +68,27 @@ accessed relative to that. e.g.
 or
   `sudo ./create_environment ~/install_scripts/your_script`.
 
+Opening Windows
+---------------
+
+To access an X11 server, clients need two things, access to /tmp/.X11-unix, and
+authorisation in X11's "access control" model. The former is automatically
+bound by the `create_environment` script, but to get the latter you will need
+to change the access control yourself. On a single-user device the simplest
+way to do this is to disable X11 access control altogether, using `xhost +`,
+but if for some reason you are testing these install scripts on a multi-user
+system, you'll want to find some way to protect your X11 server from other
+users, while still allowing your chroot host to access it.
+
+Once you have disabled access control, any X11 applications you like can be
+installed with `apt` or `zx`, and run, and the windows will open in your
+window manager, despite still being attached to the chroot. This means
+different programs can be installed, configured, and run, without access to
+any of the parent system's configs, allowing us not only to test that we have
+all the dependencies needed to run the X11 application, but also to test any
+configurations of the application that we might want to do automatically, from
+that script. (e.g. adding realms to zx, creating default wallets, whatever.)
+
 Destroy Environment
 -------------------
 
diff --git a/debian/cleanup b/debian/cleanup
index 7aad62e..0da5962 100755
--- a/debian/cleanup
+++ b/debian/cleanup
@@ -33,9 +33,11 @@ add_mounts() {
     add_mount /sys
     add_mount /dev
     add_mount /dev/pts
+    add_mount /tmp/.X11-unix
 }
 
 remove_mounts() {
+    remove_mount /tmp/.X11-unix
     remove_mount /dev/pts
     remove_mount /dev
     remove_mount /sys
diff --git a/debian/install_scripts/get_erlang_zx b/debian/install_scripts/get_erlang_zx
index 2c3d668..368233e 100755
--- a/debian/install_scripts/get_erlang_zx
+++ b/debian/install_scripts/get_erlang_zx
@@ -1,3 +1,4 @@
 #!/bin/sh
-sudo apt install erlang-base
+sudo apt -y install wget erlang
 wget -q https://zxq9.com/projects/zomp/get_zx && bash get_zx
+~/bin/zx run gajudesk