Dori said:
I think if you select home page key then select your book again you will be back at your place you were reading.
Yes, it will.
The back button takes you to the last function you were in. It's not the same as the prev page button, which takes you back a page in the whatever you are reading.
You have to play around with it to figure out what "functions" are, because they vary in different materials. For example, if you are at your home page, and open a book, then press the back button, it will take you back to the home page. In this instance, it is equivalent to pressing the home page key.
But, when I read the New York Times....if I am looking at the article list, and I select an article, the back button will take me back to the article list, at the point where I left it (the title of the article I wanted to read). This is actually really convenient and where I use the back button the most. Some of the section lists (where the articles are listed) are many screens long. If I navigate back to the section, it will put me at the beginning, but the back button puts me where I left from. (I realize this sounds very confusing. If you try it, it makes perfect sense.)
Another use of the back button: if you are reading a book with footnotes and you click on the footnote to go to it, the back button will take you back to the text.
If you look up a word in the dictionary, the back button takes you back to the text. In this case, it is equivalent to choosing the "close" option with the scroll wheel.
L