Tex output mode

[laismendes0777]

Hi, 

I would like to use emacs as an interface for a program that receives 
expressions and return expressions that use TeX tokens like \lambda \to etc. In 
this way, I would like to open a file containing tokens like \lambda into an 
emacs buffer that should shows the lambda symbol instead of the expression 
\lambda. I know that this can be done from the keyboard by setting the TeX 
input-mode, but I need the same effect when loading a file containing TeX 
commands. 

I sucessfully used emacs 22 and x-symbol package as an interface for this 
program. The problem is that x-symbol no longer works with emacs 23. 

Any help is very welcome. 

Best regards, 
Laís.