Most browsers today allow the management of Cookies in 3 different ways:
The cookies are never accepted.
The browser asks the user if each cookie should be accepted.
Cookies are always accepted.
You have more information about Cookies in: http://en.wikipedia.org/wiki/Cookie
This site can also host web beacons (also known as web bugs) Web beacons are usually small images of a pixel by a pixel, visible or invisible placed inside the source code of the Web pages of a site. Web beacons serve and are used in a way Similar to cookies. In addition, web beacons are often used to measure the traffic of users who visit a web page and be able to draw a pattern of users of a site.
You have more information about web beacons at: http://en.wikipedia.org/wiki/Web_bug
Google (Analytics): http://www.google.com/intl/es_ALL/privacypolicy.html