Populating form fields with DoQuery results

Thanks, Dan for that thoughtful reply. The issues you cited are actually reasons why I want to approach my case this way, i.e. I want the user to be able to edit the doquery-derived values once they are populated - they are intended to be sort of a starting point.
That being said, I'm having a hard time scripting this. Do you know of any sample scripts? Thanks!
More specifically, I guess I'm after examples of how to use a DoQuery call within a formula url such that I'm using the result to populate a field within the form. The parameters of the do query will be specific enough that only one value is returned, i.e. it will not return a list of values.