Launching from web a form in debug mode (?!)

Hello,
I have Developer Suite 10g with WebUtil 1.6. I am playing with a form, which has an attached library from which use a function. This function doesn't function properly and I would like to debug it.
Problem: in Forms Developer, when I launch the form in DEBUG MODE, it launches my form using the webutil configuration section. The URL looks like this:
http://localhost:8889/forms/frmservlet?config=webutil
I need to launch the form with another configuration section and at the same time in debug mode.
How should I do this?
Thank you in advacne for the help.
daniela

forms-builder:
look at Edit-Preferences, go to the last tab (Runtime) and then look at "Application Server URL"
there you can change the used section of your forms builder configuration

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