It's basically a strong developer mixed with a slow fixer - most of them, at least. Otherwise it's a super-fast developer mixed with a rapid fixer...

I have played a bit with it, and in my case found the grain to be a problem even with my 5x7" negatives. Instead I've turned to "two-bath monobaths" - single shot developer, pour in a dash of rapid fixer concentrate at the end of development. Works great, and gives surprisingly good results. My last attempt at this was with a ISO 400 film in Neofin Blau topped up with 100ml 60% ammonium thiosulphate, which should have given very obvious grain on 35mm film (from the Neofin). It didn't.