EUDA (Extended Unit Death Actions) were triggers that set deaths for extended units (Non-existant units created from high values) to change specific data in your computer's memory (E.g.: you could move a location by changing your computer's memory to say it is at X location). These have been patched because they can be harmful when put in the wrong hands.
EUDC (Extended Unit Death Conditions) are triggers that read deaths for extended units to get specific data from your computer's memory (E.g.: Text detections, arrow key press detection, HP/Energy/Shields, etc.). These memory locations have been scrambled (although they still do exist) with the last patch, so they have to be found again.
Now everything I said in the last two paragraphs is just my understandings of them, so don't take them as exactly 100% accurate.
