While reading a text, some part of it can have some special underline:
This part of text is a link pointing another file in the calculator. So you might want to select it and see the pointed file. To do so, you have to
enter in the link mode reading : push the both [DIAMOND] and [L] keys to enter in it.
In this mode, the navigation is changed : pushing [UP] and [DOWN] navigates on the links. The selected link will have its color
inversed and flicking, and the pointed file name will appear at the bottom of the screen. If no link is available at the current shown page, a message
indicating it will be drawn at the bottom of the screen.
To read the selected file pointed by the selected link, just push the [ENTER] key. To return to the normal reading, just push the [ESC] key.
