Using TXC i noted that there is no way in order to know the number of
the line i'm working on. Latex is not a "traditional" programming
language but i think that it could be very useful if the next release of
the tool let people choose to show (i.e. on the left of the text) the
number of the variuos lines of the .tex file. It's pretty easy to lost
themself in a big .tex document...