CNV-66741: Add note about single VNC connection

modules/virt-connecting-to-vm-console-web.adoc

@@ -49,6 +49,14 @@ endif::[]
 
 . On the *Virtualization* -> *VirtualMachines* page, click a VM to open the *VirtualMachine details* page.
 . Click the *Console* tab. The VNC console session starts automatically.
++
+[IMPORTANT]
+====
+Only one connection to the VNC console is possible at a time. If you attempt to create a second connection to the same VNC console, a warning is displayed, and you are prompted to disconnect the existing session before you create the new session.
+
+image::vnc-console-warning.png[]
+====
+
 ifdef::desktop-viewer,serial-console[]
 . Click *Disconnect* to end the VNC console session. Otherwise, the VNC console session continues to run in the background.
 . Select *{console-menu}* from the console list.

modules/virt-connecting-vm-virtctl.adoc

@@ -45,11 +45,29 @@ ifdef::vnc-console[]
 +
 [source,terminal]
 ----
-$ virtctl vnc <vm_name>
+$ virtctl vnc <vm_name> -n <namespace> --preserve-session
 ----
++
+where:
++
+<vm_name>:: The name of the VM.
++
+<namespace>:: The namespace that contains the VM.
++
+--preserve-session:: Prevents an existing VNC console connection from being disconnected if you attempt to start a new session.
++
+Only one connection to the VNC console is possible at a time. If you attempt to create a second connection to the same VNC console, an error is displayed and the connection fails.
++
+Example error message:
++
+[source,terminal]
+----
+can't access VMI example-vm: Internal error occurred: Can't connect to websocket (503): websocket: bad handshake: application info: Active VNC connection. Request denied.
+----
++
+If you attempt to create a second connection to the same VNC console without using the `--preserve-session` flag, this forces the existing connection to disconnect to allow the new connection.
 
-. If the connection fails, run the following command to collect
-troubleshooting information:
+. If the connection fails, run the following command to collect troubleshooting information:
 +
 [source,terminal]
 ----

virt/managing_vms/virt-accessing-vm-consoles.adoc

@@ -16,7 +16,7 @@ You can connect to the following consoles to access running virtual machines (VM
 [id="vnc-console_virt-accessing-vm-consoles"]
 == Connecting to the VNC console
 
-You can connect to the VNC console of a virtual machine by using the {product-title} web console or the `virtctl` command-line tool.
+You can connect to the Virtual Network Computing (VNC) console of a VM by using the {product-title} web console or the `virtctl` command-line tool.
 
 :context: vnc-console
 include::modules/virt-connecting-to-vm-console-web.adoc[leveloffset=+2]
@@ -52,4 +52,4 @@ You can connect to a Windows virtual machine (VM) by using the desktop viewer an
 
 :context: desktop-viewer
 include::modules/virt-connecting-to-vm-console-web.adoc[leveloffset=+2]
-:context: virt-accessing-vm-consoles
+:context: virt-accessing-vm-consoles