How can I use a template form value that is not defined in the form/list definition file(I don't want to write this form value to SQL)? Any examples I could be pointed to possibly?
You can set the variable manually with the setVar function of the templating system in the onShow function of the form. For examples, take a look at the various *_edit.php files.
You mean a submitted form value? All submitted values are in the PHP $_POST variable. You can e.g. use the onAfterUpdate or onAfterInsert functions to implement actions that occur after a form has been submitted.
Ahh, okay thanks! The appropriate method on the object to throw my code in. That completes a lot of the work I been working on, thanks!