On 7/19/2018 07:54, Hans van der Meer wrote:

The macro \completeregister[index] placed in \startbackmatter\startappendices typesets as “I Index”.
How can I change and format with my custom macro the part “Index”?

Such as using \mytitle{xyz} instead of Index?

No solution found in the Context Wiki.

dr. Hans van der Meer

Try \placeindex or \placeregister[index] and your own section heading. This is analagous to \completecontent and \placecontent.