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What is a saved query? In the QuickBase UI, a user customizes a report (a query is called a report in the UI) by selecting Customize->Reports. After the user saves this as a shared report, it becomes available to you as a query, assuming that there is no role restriction in place. For lack of a better term, we call this a saved query. Each saved query has an ID (qid) and also a user-supplied name (qname).
Creating a saved query can be an easy and quick way to construct a query, compared to constructing a query string yourself.
To use a saved query, you just refer to it by its qid (e.g., <qid>3</qid>) or by the name you gave it when you saved it (e.g., <qname>My Custom View</qname>. For the qname value, notice that you dont replace blank space between words with underscore.
How do you get a querys qid or qname? Any invocation of API_DoQuery that uses the <fmt> param set to structured will return a list of all saved queries inside a <queries> aggregate, including their qid and qnames. You can also use API_GetSchema to get the qid or qname.
QuickBase tables have two default saved queries: List All, and List Changes.