This is an article that tells the users how to detect several user infos by writing FAQ for the detecting process with javascript support. This tutorial teaches the users how to handle an IF statement for performing detecting. The author says to the users that they can detect informations like version of the javascript, operating system, browser, plugins, screen size and lot other infos. This tutorial is useful for the users to detect various informations online. This tutorial is helpful if users want to run a java applet and need to know if visitors browser is java enabled.