Where is documentation on 'fnav' resource?

[Doug Gordon]

Where is the general documentation for implementing the fnav resource for 
screen navigation on Treos? I checked both Palm and Palmsource and only found 
some knowledge base articles on how to use Codewarrior to create the resource, 
but nothing about how the resource works in the first place (i.e., do I need 
one for every form and dialog, etc.).
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