rpmbuild internals

[Philip Prindeville <philipp_subx redfish-solutions com>]

Can someone give me a quick synopsis (without me groveling through 
sources) of how rpmbuild -tb looks inside a tarball to find a .spec file?

Where does it look (in terms of sub-directories), and what names does it 
look for?  I.e. how is that name derived?

I got the impression that it looks for a file called "redhat.spec" on RH 
or FC, or else generically looks for "<package-name>.spec" ...

-Philip