PHPSESSID: a strictly necessary technical cookie that contains the session ID.
_ga: a Google Analytics cookie that enables the unique visit control function. This cookie is installed the first time a user enters the website through a browser. When the user enters the website again using the same browser, the cookie will consider it to be the same user. Only if the user changes browser will he/she be considered another user. It expires 2 years after the last update.
_gat: this cookie is associated with Google Analytics Universal. It is used to limit the request speed: limiting data gathering on high-traffic sites. It expires after 10 minutes.
ac_cookies: a strictly necessary technical cookie that contains the value showing whether the installation of cookies has been accepted. It expires 1 year after the last update.
REVOKING CONSENT TO INSTALL COOKIES. DELETING COOKIES FROM THE BROWSER.
For more information about Chrome click here: http://support.google.com/chrome/answer/95647?hl=es
Internet Explorer. Version 11
For more information about Internet Explorer click here: http://windows.microsoft.com/es-419/windows7/how-to-manage-cookies-in-internet-explorer-9
Firefox. Version 18
You can accept or reject cookies individually in Firefox’s preferences in the History section in Tools > Options > Privacy.
For more information about Mozilla Firefox click here: https://www.mozilla.org/es-ES/privacy/websites/#cookies
Safari Version 5.1
For more information about Safari click here: http://support.apple.com/kb/PH5042
Options – Advanced – Cookies.
The cookie options control the way in which Opera handles them and therefore whether you accept or reject them.
For more information about Opera click here: http://help.opera.com/Linux/10.60/es-ES/cookies.html
See the documentation for the browser you have installed.