Frequently, a Web page or an FTP site has protected areas open only to those with a valid login. As you browse to the page, a form appears querying the user id and password. While this feature is nice for a human user to log on interactively, it could be problematic if you want to automate this Web page or FTP site programmatically or create a shortcut without the interactive login. To solve this problem, you can embed the user id and password into the URL. For example:

http://userid:password@www.anywhere.com/
ftp://userid:password@ftp.anywhere.com/
http://root:arduino@192.168.0.102/arduino/digital/13/0
http://root:arduino@192.168.0.102/arduino/digital/13/1