Starts the choosen editor ("Configuration | General Settings | Mixed") with the selected script for changing them.
For syntax of scripts see the explanations to Hamster scripts.
For comfortable and orderly editing of scripts and score files there exists Syntaxshemata. These are templates for respective editors with different components of the syntax to colour them differently. Addition indications can be found in the Hamster script-archive: http://home.t-online.de/home/micha-wr/hamster/ (German Site).