Ok, I found the Documentation Browser was brought up by clicking the double right arrow in the lower right corner of the Process Explorer, as Rogelio indicated. I was hoping to study the documentation for some processes I've not used yet (specifically, Deconvolution) but there are only the 4 or so processes with documentation that have already been posted available.
The installation also made all the icons disappear from my desktop, but (minor point) a right click on the desktop with "show icons" selected, restored them to the desktop. (Not sure why/how that got turned off by the PI 1.6.09 installation.)
Looks good although I'm disappointed about not getting any new documentation with it but guess more patience is required.
Clear skies (in short supply recently),
Jeff