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Hello.
I am relatively new using the excellent texmacs but I have a question. I want 
to use the plugins (like yacas or other computer algebra system) in 
background, non interactive, this way:

For example I have written in the texmacs :

9
--
45

I want to select this expression and, after giving a command (or using the a 
special shortkey), an yacas (for example) process is used in the background, 
the texmacs send it the selected input and, after yacas processing the 
texmacs will append

   1
= --
   5

So that in the texmacs window will be displayed:


9    1
-- = --
45   5
 

How can I do this?

Thank you very much.

Paulian Bogdan Marinca