Adriweb, you can also use math.eval to execute a function in a library document (not in the current tns file) and return stuff saved there.

Well, I'll try my best to explain them.

Imagine you have a game were you can have many different cars. All the cars have different things like engine power, but still share much stuff. This is were classes come in.
With classes you can make a basic structure of an object, and create new objects based on the first one. Nspire Lua has the class() function that saves us lots of work.

Example:
car = class()

function car: init(power, type, lights, etc)
    self.power = power
    self.type = type
    self.lights = lights*2
    self.options = etc
end

function car: drive(speed)
   return self.power * speed -- this doesn't make much sense, but its just an example
end

Now, once we made our basic car class, we can define cars using this class:
volvo = car(10, "2x2", 4, {air-conditioning = True})
jeep = car(60, "4x4", 12, {air-conditioning = False, trailer-hook = True})

jeep:drive(10)       -- returns 600
volvo:drive(20)      -- returns 200

if jeep.options.trailer-hook then
   print("The jeep can have a trailer")
else
   print("No trailer for you :(")
end

This is just a basic example, and it written here without testing, so it can have some bugs.

Thanks

Oh, and congratulations with your new CX

Edit: or wait, I'm confusing you with someone else

ouch, thats bad internet!
Good luck anyway!

Yes, there is software named "tilp". However the package in the ubuntu repo is a bit outdated, so you must install it from source. But that isn't so hard, here is how to do it:

First download this script: http://lpg.ticalc.org/prj_tilp/download/install_tilp.sh
Copy it to your home directory ("/home/northern_snow")
Open a terminal (Applications --> Accessories -->Terminal)
Run this:
sudo apt-get install subversion autoconf automake libtool libglib2.0-dev zlib1g-dev libusb-dev libgtk2.0-dev libglade2-dev libsdl1.2-dev gettext bison flex groff texinfo xdg-utils libarchive2-dev intltoolThis will install all the dependencies to compile tilp.
Then run this:
chmod +x ./install_tilp.sh
sudo ./install_tilp.sh
You will be asked for your password, type it (it's normal that you don't see it while typing).
Then wait for the installation to finish.

When it's done (without any errors) you have successfully installed and compiled tilp. To use tilp just run "sudo tilp" in a terminal.

Edit: updated for the latest version of TiLP

I recently started having a problem with omnomIRC that it wouldn't save its setttings. This means that I can't enable time stamps and other channels.
The problem is that the cookies don't get saved because its running in an iframe in another domain.
The solution to this problem is to change the src of the iframe to "http://omnom.omnimaga.org/omnomirc_dev/" instead of "http://netham45.org/omnomirc_dev/".
I don't know if this will create other issues, but I don't think so.