TRichView.com

As I remember there was a demo (with unit) on how to sort a table. Is it still available somewhere?

Search in this obsolete forum engine is useless, cannot find it.

It is included in RichViewActions, in TableSort.pas
If you use RichViewAction, you can use TrvActionTableSort.
If you do not use RichViewActions, you can only use TableSort.pas unit, it is not linked to other RichViewActions code.