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If I set a persistent cookie to expire after 30 minutes I would like to know if this means the cookie will expire after 30 minutes regardless of the user being still logged into the site or does this mean after the user closes the browser from that point on it will take 30 minutes to expire. <br />
I'm publishing Sharepoint through ISA and wanted to find a more secure way of dealing with persistent cookies.
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If I set a persistent cookie to expire after 30 minutes I would like to know if this means the cookie will expire after 30 minutes regardless of the user being still logged into the site or does this mean after the user closes the browser from that point on it will take 30 minutes to expire. 
I'm publishing Sharepoint through ISA and wanted to find a more secure way of dealing with persistent cookies.

Persistent cookie time

Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.

Web Browsers

Web development can range from developing the simplest static single page of plain text to the most complex web-based internet applications, electronic businesses, and social network services using a wide variety of languages and standards, including the familiar HTML, JavaScript and jQuery, ASP and ASP.NET, PHP, ColdFusion, CSS, PHP, Flex and Flash, but also the implementation of a broad list of standards including XML, WSDL, SSDL, VoiceXML and many more.

Web Languages and Standards

A web server refers to the software that helps to deliver web content that can be accessed either through the Internet or through an intranet. The primary function of a web server is to store, process and deliver web pages to clients. The communication between client and server takes place using the Hypertext Transfer Protocol (HTTP). The most common use of web servers is to host websites, but there are other uses such as gaming, data storage, running enterprise applications, handling email, FTP, etc.