Simon, you might have just hit it.

I can use Control:PC to control zones running under Control:PC on other PCs.

If Touch:PC can also control Control:PC zones on other machines, then it should be able to control a Control:PC zone running on the same PC as Touch:PC.

Thus you have your solution, albeit not in a single application.

In the spirit of Spinaltap, I would like to confirm that I am not involved in the corrupt theft of a global sport.