Alright I see…The only way to see what arguments these macros accept is to try it out in the command line…
So I found out in try-and-error-style how to open a specific GH-file by script:
rs.Command('_-Grasshopper' +' '+ 'Document' +' '+ 'Open' +' '+ 'somefile.gh')
This still does not resolve for me the question why there is a scripting docu about Rhino and rhinoscriptsyntax, but none about macros…
Nevertheless thanks very much so far
Regards,
Mr Sinter