If you mean 'Parameter Queries' then YES they are, see http://www.ehow.com/how_2020612_create-parameter-access.html
To use on in a mailmerge, create a mailmerge document and when you get to the datasource
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I'm writing to share my clumsy experience in using this elegant tool so you can avoid every stupid mistake I made. (I leave it to the authorities to decide if this deserves a place in the Knowledge archives.) Now that I am on the other side of my l…