Change an ID of a list Item

How do i find where the data is kept for list items of a certain list. I have a reservation system and the system sorts by ID as opposed to name so now its out of whack because someone forgot to add a room. I certaingly cant figure out how to change the xsl for the availability page. Helping me either way would be appreciated.
[329 byte] By [JasonAMoss] at [2008-1-2]

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