emacs-clipboard gotcha

I was using emacs on linux and i was accessing emacs window on a vnc terminal window on a windows box. I couldn't seamlessly transfer copy paste, clipboard contents between the windows. Here are the things that must be done:
o For enabling copy paste between vnc and windows, use the app: vncconfig
o For enabling copy paste between emacs window and the other windows on the linux box as well as the windows box from which i was vncing into, you should do this in your .emacs file:
(set-variable (quote x-select-enable-clipboard) t)
o I tried invoking the emacs function: menu-bar-enable-clipboard but it didn't enable the clipboard but once i evaluated the above lisp fragment, things seemed to work fine.