TightVNC cannot exit full screen in Windows 7

To exit TightVNC's full screen on Windows 7:

Press all four keys: Ctrl + Alt + Shift + F

Press F8

"You can enter and exit full screen mode using the toolbar at the top of the VNC viewer window. The F8 key can be used to hide and unhide this toolbar."

https://support.realvnc.com/knowledgebase/article/View/376/12/how-can-i-enter-and-exit-full-screen

And... to force any future session to be windowed rather than full-screen:

Start TightVNC Viewer and enter your remote address, but before hitting the Connect button, open the Options dialog and de-select the Full Screen checkbox.