When you activate VIOT for your KEG, the following process occurs:
1. You load the DMS on your computer.
2. In PMM, you "activate" VIOT using the code that Phatnoise gave you.
3. PMM communicates with PhatNoise to validate the code, and writes an activation key onto the DMS.
4. You insert the DMS into your Keg.
5. The Keg reads the VIOT activation key, and then erases it (I beleive).
This means that you can't use the same code to activate VIOT on multiple Kegs - it's a one-shot process. Also, if you insert your DMS into a different Keg _before_ inserting it into the one you want to activate, then the wrong Keg will get activated. Simple enough to fix - swap the Kegs. But still and issue to be aware of.