If you want alert boxes to include a Help button that provides access to a Stack Trace dialog box and the Debugger, use the SESSION handle and set the DEBUG-ALERT attribute to TRUE. Use the following sample code if you want alert boxes to include a Help button: 

SESSION:DEBUG-ALERT = TRUE.

For more information on starting the Debugger from alert boxes, see Start and Stop the Debugger

Note: You can enable this feature when you start an ABL client using the Debug Alert (-debugalert) startup parameter. For information on this startup parameter, see the reference entry in Startup Command and Parameter Reference.