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:[email protected]/
ftp://userid:[email protected]/
http://root:[email protected]/arduino/digital/13/0
http://root:[email protected]/arduino/digital/13/1

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