I am having a hard time understanding what you actually ask for. But let me try to provide an answer...
You might be asking for a viewer which allows to connect to multiple hosts and switch between the connections like in a tabbed document viewer. I think it's not the first time such a thing is asked. As of now I think each viewer can connect to only one host. But you can of course run multiple viewer instances. Each of them within its own window.
A similar limitation is bothering PuTTY users for years where I am used to tools like mRemoteNG.
I was trying to use UltraVNC viewer integration into mRemoteNG as an external tool using the following configuration:
- Name: UltraVNC viewer
- Filename: C:\Program Files\UltraVNC\vncviewer.exe
- Arguments: -connect %HOSTNAME%:%PORT% -keepalive 20 -user %USERNAME% -password %PASSWORD%
This is working just fine if I am using mRemoteNG as a pure launcher but when enabling "Try to integrate" option to fit the UVNC viewer window within mRemoteNG it is able to catch the connection-status window only but then UVNC viewer is spawning another Window which is not catched by mRemoteNG.
If Rudi is willing to he might add an option to skip showing the connection status window and just display the VNC viewer (or an error if connection fails) so integration would perhaps work.
I feel this might end up in a discussion also about the connection window shown during connection establighment. I personally never liked it and would always have preferred the viewer to open the main window directly ans show connection status either in the status bar or in some sort of status log in the toolbar where it currently displays the hostname on top right for example. The pop-up detail status window would still be accessible via the "info" button in the toolbar.
So bottom line is: Yes you can start multiple viewers but you can't have multiple connections in a tab-style multi-document like interfrace. Also integration into tools like mRemoteNG is limited due to the way how UVNC viewer is creating multiple windows during connection phase. Perhaps another VNC viewer might work in this scenario.