SQL Server Express Int Pkey Auto-Increment versus SQL 2005 Identity

While researching my previous problem, I read a reply to another post that SQL 2005 does not offer the integer primary key auto-increment feature present in MS Access and SQL Express.
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I wasn?t aware of this when I uploaded my aspnetdb.mdf file to DASP and attached it to my SQL 2005 database using the DASP tools.
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However, the auto-increment seems to be working fine and I have made no changes to it. Does the DASP SQL Attach tool magically make some conversion from the SQL Express integer auto-increment to the SQL 2005 identity?
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I?m novice at this, and simply curious, that?s all.
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Thanks,
</o>Lar