Compiz question

[Bart Silverstrim]

Sridhar M.A. wrote:
> On Fri, Nov 09, 2007 at 09:54:16AM -0500, Bart Silverstrim wrote:
>    > 
>    > The one system has a feature enabled that I don't know how I did it...I 
>    > move the pointer into the upper left corner of my four-desktop cube, and 
>    > the display "zooms out" to show all four desktops side by side, where I 
>    > can move windows among workspaces and see real-time content of the 
>    > windows.  Double clicking on a desktop or application from that view 
>    > zooms into that workspace to fill the screen again.
>    > 
>    > The other system I don't have this available by default.
>    > 
>    > Any clues??
>    > 
> It is the Expo plugin. 

How did I activate it?  I don't see it under the gl-desktop's settings 
unless I'm overlooking it, and didn't see it under synaptic.