Can a script-fu execute another script-fu interactively? (revised subject line)

I'm trying to get one script-fu to return a value (presumably a list) to another script-fu. I can't seem to get the parent script-fu to get a return value from the two children scripts-fu, nor can I get the child scripts-fu to display a dialog box to get a parameter.

Simple test case uploaded. Placing the 3 files in the script-fu folder and refreshing creates a Debug menu with the script "Test two dialog boxes".