14 System functions

JavaScript can access information from several areas on the user PC.  This data may
be placed in a form which can then be transmitted across the Internet to a server :

Navigator
The navigator object, which represents the browser, has properties which JavaScript can access :

appCodeName  code name under which browser was developed
appName   name of browser
appVersion  version number of the browser
cookieEnabled readonly property to determine if browser will allow cookies to be written
Language  language of browser (Netscape)
userLanguage language of browser (Internet Explorer)
mimeTypes  array of all MIME types known to client 's computer
platform  type of OS platform :  WIN, MAC, LIN
plugins   array of all the plug - ins that are installed in the client 's web browser
userAgent  typically appCodeName / appVersion, but may have other undefined text content

Cookies
If cookies are enabled on the user PC, JavaScript can write a cookie.  In addition to the
information above, it can contain any information that the user has typed into input elements
on the page.