Lyx -> Lyx

[Humbert Francis]

I am working on a program which corrects math exercises done by my 
students. This program insert error messages (in red) in a Lyx document. 
The input of this program is a Lyx document and the output is also a Lyx 
document. I did not manage to install such a converter. Which wiewer 
should I declare in the preference window ? Would this converter replace 
the current document (it would be the best solution) ? create a new Lyx 
view ?
I could create the corrected doc in pdf format, but I prefer avoiding my 
students installing a latex distribution.
My present Lyx version is 1.4.2.