After a few days thinking and encouraged by p2, I'm opening this topic to start a pack or collection of programs to help any student or worker (you don't know who will use this programs).
So, the idea is, i have a lot of excels made for calculate (with accurated methods) some of the most used in the engineering world like:
Binary distillation (McCabe-Thiele method)
At the end of the day, the real use of the ti nspire and the other calculators is to make easy our calculations
And for do that i'm asking help to the CW comunity.
Thanks for your attantion.
P.D: Add some excels so you can make an idea of what i'm talking about.