Jivtesh shows off his 3 Top Scenarios when using Support Debugging Tool. My top 3 real world uses are a little different. They are:
1) Dex SQL logging
2) Security Tracing
3) Changing company colors.
About Dynamics, Development and Life: 3 Top Scenarios when I use Support Debugging Tool
Archived post from 2011. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.