[Uppercase parameter]Any Text[/Uppercase]
To convert certain characters to upper case, put them inside an [Uppercase] context.
Example (normally you would put the following text into a .tpl file on your server and use a web browser to link to it):
In the example above, the displayed text will be
SOME TEXT THAT CONTAINS UPPER- AND LOWER CASE LETTERS
This context is most often used with [username] and [password] tags, because many web servers do not allow lower case letters to be sent from the browser's realm protection dialog. By making sure that all usernames/passwords entered into a database are uppercase, you can be sure that all browsers and web servers will work properly for password authentication.