For connoisseurs, especially site administrators, a visitor whose browser is identified with User Agent : Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html) , Googlebot/2.1 (+http://www.google.com/bot.html) and Googlebot/2.1 (+http: //www.googlebot.com/bot.html), suggests the visit of a bot / crawler of the Google search engine.
An ordinary user has a user agent given by the browser on which he access the site. In the case of someone who uses the Browser Opera, User Agent is: Opera/9.64 (Windows NT 6.1; U; and) Presto/2.1.1
Testand Safari, I noticed a very interesting thing integrated into this browser. The possibility of Change user agentthe like they like. It even allows the setting of an agent user, similar to the one used by Googlebot.

The result:

All you have to do to change your user agent, is to install the Safari browser, go to the menu Develop -> User Agent -> Other ..