Ubuntu – command for the “Workspace Switcher”

11.04command lineunity

I just learned about "whereis" in terminal as a way to find a command to launch a given application. However, I still can't find (a way to find) the command to launch the "Workspace Switcher" in natty / unity.

I'd be interested in both the method(s) for finding the command as well as the command itself.

sudo apt-get install xdotool

xdotool key super+s