VNC Settings, Start, Kill, and close all windows.

VNC settings
Display Port User ID
3 5903 user3
4 5904 user4
5 5905 user5
If user finds her/his vncserver is not running right, she/he can stop and restart the vncserver from PUTTY or SSH session as:
   However, the user is NOT allowed to restart other vncservers meant for other users.
Putty host-dev –l user5     <== login with putty as user ‘lumichal'
[user5@host-dev ~]$ vncserver -kill :5   <== Kill vncserver for display 5 assigned to user5
   3. Restart vncserver for your display (for example 5, for user user5 )
[user5@host-dev ~]$ vncserver :5

Log out CLOSING ALL windows:  ( See the link here )

If you alter the "xstartup" script to run everything except the 
window-manager in the background (i.e. with the "&" suffix), then run 
the window-manager (in the foreground), and finally add: 

vncserver -kill $DISPLAY 

Then the desktop will be shutdown when the window-manager exits, which 
is usually what happens when the user selects "Log out".