[NTG-context] Difference between \startmakeup and \startstandardmakeup

I have been using \startstandardmakeup etc. for some years now. I note on the wiki that there is a command \startmakeup also. It is not covered in my copy of the Manual. What are the principal diferences between the two? -- John Culleton Wexford Press Book layout, typesetting and Indexing Free list of books for self-publishers: http://wexfordpress.net/shortlist.html