I wish to implement a sort of BEFORE_TRIGGER on the insert button of a form, which will pop up a window requesting users to verify that they have entered correct information on the form, before the information is summitted to the database.
when your forms have been built with ADDT
(e.g. using the Insert Record Form Wizard), you can always apply ADDT´s "Validate Form" server behaviour to it -- this is actually a very powerful behaviour which lets you define a validation rule
(choose from many predefined ones) & error message for each field separetely. However, it will display warning messages in the same document, not in a popup window