Honda Car Forum

Hello

Could anyone who knows how Honda's TSB (Technical Service Bulletin)
system work in US answer the following question?

I see that Honda's TSB Database is at least partially available at NHTSA
Web site. However, my Honda dealer is unable to find some documents that
I see through NHTSA database in their "official" TSB database (they call
it IRIS or something like that). Does anybody know what is this TSB data
available from NHTSA site? How official is it? And if it is official, is
there any way to establish the correspondence between NHTSA database
documents and TSB's used at Honda dealerships?

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Best regards,
Andrey Tarasevich