not happy with the shit that there are notes of this course on the operation of certain aparatejos (keyboards, touch screens, scanners, etc.), I got to get into Wikipedia (goddess of page) and search for the word mouse to see if explained how it worked in a technical but readable ...
... And I must confess that I have a good time reading me this:
http://es.wikipedia.org/wiki/Raton
Seriously, I wonder if it is very serious.