VS2005 - Newbie - TableAdapter not configured, but it updates!!

Hello,

I have a data layer where I put a dataset to a SQL Server 2000
database. I referenced that dataset in the user interface layer. I
forgot to configure stored procedures, sql statements or anything for
Table2, yet it updates the SQL Server database! Is there some kind of
default update code that works without configuring??

Why does this work? How does this work??

Thank you,
dbuchanan