I've done it with PrE11. It may be the same in 9.
The set up is mostly in Windows. It is largely automatic and there are few choices.
In PrE there is one choice to switch to two monitors and few options.
In version 9, you can remove all of the panels from the interface EXCEPT the big one: the Tasks panel.
How you arrange them across two monitors depends on what your priorities are. In most cases, people put the timeline in a separate panel, since it's often the one you need the most vertical space with. (And, as Bill notes, in version 11, the timeline is the ONLY panel you can separate from the rest of the interface.)