On Mon, 18 Aug 2014, Werner Hintze wrote:

> I don’t know if I use MKII or not.

(Simplified version). If you compile the file using `context filename` 
you are using MkIV; if you compile the file using `texexec filename` you 
are using MkII.

Unless you have a really good reason to stick to MkII (legacy code, etc), 
use MkIV.

Aditya