ProjectBuilderWO vs. ProjectBuilder


Excuse my ignorance with the dev tools for OSX, but what is ProjectBuilderWO used for? Any docs that I have found are for ProjectBuilder (not WO). What is WO, and what is this version used for?
Before the Public Beta there was only one Project Builder, it did all sorts of great stuff. It interoperated with Interface Builder (used for Cocoa Apps) and WebObjects Builder (used for WO apps).

With the transition to Cocoa+Carbon and to OS X they began developing a new project builder from the ground up. The problem is that the new PB does not yet interoperate with WOBuilder... so they have renamed the old PB (which does) to Project Builder WO and kept it until the new PB does WO.

This info is all in the docs anyway...