>Is it possible to have a 2nd listbox's source control come from the selection of a 1st listbox? I'm sure it is for you veterans.

That's not a problem. You should just 'reset' listbox2.rowsource in Listbox1.InteractiveChange event. Actual 'Resetting' depends on what RowSource you will use. I prefer to use cursor, and refill it each time user will pick up new value from the first list. Remember Listbox2.requery to get new appearance.