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+
+How to Share A Screen Across Qubes
+==================================
+
+> Warning:
+> This guide involves opening up a TCP port between qubes. This is discouraged from the security standpoint and should only be used as a last resort, use sparingly.
+
+## Terminology
+PRESENTATION-QUBE is the Qube you want to view the screen from
+
+CONTENT-QUBE is the Qube that has the window you want to share
+
+## Setup The Shared Screen Server
+
+Choose one of these sub-sections depending on whether you want to open a new screen (increased isolation), or use an existing monitor or screen.
+
+### If You Want To Share a New Screen
+
+In the Content Qube:
+
+1. Install packages `sudo apt install xfwm4 tigervnc-standalone-server tigervnc-viewer` or `sudo dnf install xfwm4 tigervnc-server tigervnc`
+
+2. Enter the password by executing `vncpasswd`
+
+    1. You can generate secure enough passwords for this purpose using `openssl rand -base64 16 | tr -d '+/=' | head -c 8;echo`
+    
+    2. Enter one password for read/write (first password and verify prompt)
+
+    3. Enter a different password for the view only password (second password and verify prompt)
+
+3. Start the server `vncserver :1  -xstartup /usr/bin/xfwm4 -geometry 1920x1080 -localhost no`
+
+4. View the shared screen `vncviewer -passwd ~/.vnc/passwd :1`
+
+5. Open applications `DISPLAY=:1 xterm` where xterm can be any binary on your system
+
+## If You Want To Share an Existing Monitor or Window
+
+In the Content Qube:
+
+1. Install packages `sudo apt install xfwm4 x11vnc x11-utils` or `sudo dnf install xfwm4 x11vnc xwininfo`
+
+2. Enter the password by executing `x11vnc -storepasswd`
+
+    1. You can generate secure enough passwords for this purpose using `openssl rand -base64 16 | tr -d '+/=' | head -c 8;echo`
+
+3. Start the server 
+    
+    1. If you want to share a window `x11vnc -viewonly -rfbauth ~/.vnc/passwd -rfbport 5901 -clip 1920x1080+0+0`
+
+        - Replace `1920x1080+0+0` with the resolution (e.g. `1920x1080`) and offset (e.g. `+0+0`) of the screen area you want to share. The coordinates 0,0 are in the top left, increasing down and to the right.
+
+        - Use `xrandr --listactivemonitors` in Dom0 to get a list of all monitors and their offsets. That command returns in the form `W/_xH/_+X+Y`. For example to share DP-1, with xrandr output of ` 0: +DP-1 1920/510x1080/287+1280+0 DP-1`, 1920x1080+1280+0 would share just that screen.
+
+        - `arandr` is a useful graphical tool to show where all the monitors are in relation to each other.
+
+    2. If you want to share a monitor `x11vnc -viewonly -rfbauth ~/.vnc/passwd -rfbport 5901 -id pick`
+
+        - This retrieves the numerical id of the next window you click on.
+
+    3. If you want to share all the monitors use `x11vnc -viewonly -rfbauth ~/.vnc/passwd -rfbport 5901`
+
+4. View the shared screen as specified in "View The Shared Screen"
+
+5. Open applications like normal
+
+## Qubes Connect TCP Service
+
+These steps are a simpler version of [The Qubes Firewall](https://www.qubes-os.org/doc/firewall/#opening-a-single-tcp-port-to-other-network-isolated-qube). In dom0 execute these steps:
+
+1. Edit /etc/qubes-rpc/policy/qubes.ConnectTCP 
+
+2. Add the line: `<PRESENTATION-QUBE> @default ask,target=<CONTENT-QUBE>`
+
+    - (recommended) By specifying `ask`, dom0 will ask each time a connection is attempted on that port
+
+    - (not recommended) Rather than specifying `ask` you can use `allow` to allow all connections without a prompt, this leaves you unaware of new attempted connections.
+
+3. After you are done sharing you screen, remove this line to prevent further unwanted connections
+
+## View The Shared Screen
+
+In the Presentation Qube:
+
+1. Install package `sudo apt install -y tigervnc-viewer`
+
+2. Bind TCP port using Qubes Connect TCP service `qvm-connect-tcp ::5901`
+
+3. Start the VNC Viewer `vncviewer -Shared -ViewOnly -RemoteResize=0 -SendPrimary=0 -SendClipboard=0 -SetPrimary=0 127.0.0.1:5901`
+
+4. Confirm that you want to connect to the Presentation Qube in the dom0 prompt
+
+5. Enter password for the VNC server you created above
+
+6. In your presentation software share the VNC viewer
+
+## Present
+
+In the Content Qube interact with the shared screen, the changes will be mirrored back to your Presentation Qube.
+
+## Notes
+
+- To reset the VNC password delete `~/.vnc/passwd` in the Content Qube
+
+- The Content Qube does not need to have access to the internet
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