[documentation] general handbooks question

[Laura Scott]

I have a client who's looking to create documentation (for their own  
products) using the books module, who is wondering how the main  
handbooks sections pages have been set up. Is this done via php calls  
or manually? I'm assuming that each major section is its own book --  
hence the changing navigation block, right? -- with that book's top  
level page using custom php calls, yes?

Any insights, general or specific, would be appreciated and I'll pass  
it on.

Thanks!

Laura