selectedPageName is the page you first want to show. It's the same concept as a tabbed table, where selectedTab is the tab to show by default.
Dojo 1.6.1 is loaded from an OSGi plugin. The files are in the jar, not in the domino folder like 1.5.1. iNotes, though, requires 1.5.1, which is why those files also get installed. There's more on the Dojo plugin and how to access the files within the jar in the XPages Portable Command Guide book.