While looking through the wiki I found this:
How exciting!
I've been looking for a way to do this for some time (even good ol' Process Lasso throws up its hands).
However, in addition to not recognizing that the game actually runs at Below Normal, it does not seem to work.
I tried integers, various "magic numbers" and so forth, but no luck. Does anyone know if this useful command still exists? If so, what kind of "number" is it looking for? I get no error when I try, just no joy as far as the process priority is concerned.
If no news, I will update the wiki that this function no longer works.