How to setup multiple monitors on Xfce desktop?

I just followed the instructionson Xorg RandR 1.2 wiki - http://www.thinkwiki.org/wiki/Xorg_RandR_1.2

Lets find out how many monitors we have connected?

$ xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 800, maximum 8192 x 8192
LVDS1 connected 1280x800+0+0 (normal left inverted right x axis y axis) 261mm x 163mm
   1280x800       60.0*+   50.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 connected (normal left inverted right x axis y axis)
   1680x1050      60.0 +
   1280x1024      75.0     60.0  
   1152x864       75.0  
   1024x768       75.1     60.0  
   800x600        75.0     60.3  
   640x480        75.0     60.0  
   720x400        70.1  
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)

Now ask Xrandr to configure them:

$ xrandr --output LVDS1 --auto --output VGA1 --auto --right-of LVDS1

Now thats simply cool!