[luatex] TeX scanner

[Andreas Matthias]

Is it possible to call the TeX scanner from within Lua?

I would like to put a string into a box and then work on the node list.
If the string were available on the TeX side I would 

  \setbox0\hbox{...}

and the use it on the Lua side

  tex.box[0]

But what should I do if the string is generated on the Lua side and
thus no available on the TeX side? Is it possible to call the TeX
scanner to read this string?


Ciao
Andreas