xvfb

1. sudo apt-get install xfonts-100dpi xfonts-75dpi xfonts-scalable xfonts-cyrillic
2. sudo apt-get install xvfb
3. sudo apt-get install xtightvncviewer
4. apt-get install x11vnc
5. sudo apt-get install fluxbox
6. export DISPLAY=:1
7. Xvfb :1 -screen 0 1024x768x16 &
8. fluxbox &
9. x11vnc -display :1 -bg -nopw -listen localhost -xkb
10. export DISPLAY=:0
11. vncviewer -encodings 'copyrect tight zrle hextile' localhost:5900
12. you should see fluxbox running within another window which you can navigate
13. try, for fun
1. export DISPLAY=:1
2. xterm
3. pkill fluxbox
4. fluxbox &

Gets weirder

1. close the above vncviewer window
2. x11vnc -display :1 -bg -nopw -listen localhost -xkb
3. x11vnc -display :1 -bg -nopw -listen localhost -xkb
4. x11vnc -display :1 -bg -nopw -listen localhost -xkb
5. vncviewer -encodings 'copyrect tight zrle hextile' localhost:5900
6. vncviewer -encodings 'copyrect tight zrle hextile' localhost:5901
7. vncviewer -encodings 'copyrect tight zrle hextile' localhost:5902

Launch apps in the new display

1. sudo apt-get install firefox
2. DISPLAY=:1 firefox &

Note: if vncviewer is not available on the CLI, use xtightvncviewer instead, same thing

See: http://en.wikipedia.org/wiki/Xvfb