This is just a quick tip for anyone that uses VNC, expecially on Linux.  This works in TightVNC and maybe others too, it might be a VNC standard.  When using the VNC viewer or client on Windows, you can right click on the title bar of the window to get some extra options, like sending Ctrl-Alt-Del to the host to log into a Windows box.  When using this on Linux, right clicking on the title bar had no effect.  Uh oh, how was I going to login to my Windows box?  Well, I found that F8 will bring up the menu and allow you to do various things, including sending keystrokes to the host you are connected to.  So, there you have it.  When in doubt, try F8 when using the VNC viewer.