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How to disconnect a Windows 7 PC client from an ubuntu TightVNC server?

Seems like it should be simple, I assumed just a key combination or some icon I could drop on the desktop.  I am accessing a ubuntu 14 machine, which is a TightVNC server using a Windows 7 TightVNC client.  No connection problems.  But I see no way to kill the session, so I have to ^-alt-del to get my Windows Task Manager and kill the VNC program.  Surely there is a simple way to disconnect from within the session.  The desktop is Windows 7-64.  Both machines are within my LAN.
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Most Valuable Expert 2015

Commented:
Just click on the "X" in the upper right corner of your VNC window.
Mike CaldwellConsultant to IP industry

Author

Commented:
There is no window nor X to be seen.
Mike CaldwellConsultant to IP industry

Author

Commented:
I normally launch to full screen.  If not, then there is a window, but there is no X,
Most Valuable Expert 2015
Commented:
Then change it from fullscreen mode to a window.
Mike CaldwellConsultant to IP industry

Author

Commented:
Read my post: I can get a window by not launching into full screen, but there is no X for that window.
Most Valuable Expert 2015

Commented:
I was posting that before I saw your new comment. Then just press Alt+F4 to close the window. Or look for another client that has the "X" like normal Windows do.
Mike CaldwellConsultant to IP industry

Author

Commented:
Thanks for the nudge rindi, it got me to experimenting with key strokes and settings.  It turns out that what I needed was an Option when launching the client, to set scaling to 90%.  When I do that, I do get an X.
Mike CaldwellConsultant to IP industry

Author

Commented:
However Alt+F4 does not do anything.
Mike CaldwellConsultant to IP industry

Author

Commented:
PS: finally found what I was really looking for. { Ctrl+Alt+Shift+F } takes it out of full screen, switching to a window with an available X.
Most Valuable Expert 2015

Commented:
Alt+F4 closes the window that is active. So if it isn't active, and not in Window mode, then it wouldn't do anything.
Mike CaldwellConsultant to IP industry

Author

Commented:
Even easier now; allows me to open the TightVNC window in full screen.  Amongst the icons in the upper right hand corner is a Help icon.  It has a drop down which includes "Disconnect 192.168.x.xxx", which is the IP address of my client side.  Just click and done, don't even need a keyboard.
Most Valuable Expert 2015

Commented:
Personally I wouldn't use VNC anyway, but rather SSH. With SSH you can access a remote Linux Terminal from Windows using Kitty, for example, and if you need GUI applications that are running on the SSH host, you can use set SSH for X-forwarding, and if you have xming loaded on your Windows PC, you can then start those applications and they will look like normal Windows programs. SSH is more secure and faster than VNC.