For visually impaired people: To increase/decrease the font size use the two-key combination Ctrl and +/- or Ctrl and scrolling up or down with the mouse wheel.

Most items of the site are accessible using the following two-key combinations:

Alt and respective letter/number in Windows platform.
Ctrl and respective letter/number in Macintosh platform.
In certain browsers (e.g. Internet Explorer), use the special keys + ENTER.
In Mozilla Firefox browser, use SHIFT+ALT and respective letter.
This is a list of the special keys:

i – Home page;
t – Map;
s – Search;
Switching between languages – use the first letter of your respective language;
n – this page (instructions);
When browsing internal pages, you can use the Tab key to move through the links.