[NTG-context] Where is \typescriptthree documented?

[Hans Hagen]

David Arnold wrote:

> All,
>
> I don't understand \typescriptthree. Where is it documented? What  
> does it mean?
>
it's a trick to make efficient typescripts and normally not  meant for 
users to be used  (ok, since they look into the files in distributions, 
users tend to use such low level  thingies anyway)

\usetypescript[one][two][three]

when such a request matches, the corresponding matching keyword is 
assingd to \typescriptone|two|three

Hans