Some companies track site statistics, such as how many times their content is accessed and by which types of Web browsers. User agent strings help to identify the browser type.
If you gather browser statistics and your information includes the user agent string, you can track the usage of your customized browser. In the Internet Explorer Customization wizard, you can add characters to the end of the user agent string to customize it.
Your customized string will appear in any statistics that include the user agent string. Be aware that other companies that track statistics will see your customized string. Avoid using a string that you don't want others to see.
Here's an example of a user agent string:
Mozilla/4.0(compatible; MSIE 5.0; WindowsNT; YourCustomString)