URI Scheme
AOL Instant Messenger's installation process automatically installs an extra URI scheme ("protocol") handler into some web browsers, so URIs beginning "aim:" can open a new AIM window with specified parameters. This is similar in function to the mailto: URI scheme, which creates a new e-mail message using the system's default mail program. For instance, a web page might include a link like the following in its HTML source to open a window for sending a message to the AIM user notarealuser:
Send Message
To specify a message body, the message parameter is used, so the link location might look like this:
aim:goim?screenname=notarealuser&message=This+is+my+message
To specify an away message, the message parameter is used, so the link location might look like this:
aim:goaway?message=Hello,+my+name+is+Bill
When placing this inside a URL link, an AIM user could click on the URL link and the away message "Hello, my name is Bill" would instantly become their away message.
To add a buddy, the addbuddy message is used, with the screenname parameter
aim:addbuddy?screenname=notarealuser
This type of link is commonly found on forum profiles, to easily add contacts
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