The documentation is distributed with the developer version of IQFeed.
If you are a registered developer, you can download the developer version from the developer support area of the website after logging in via the link above (in Tim's post). The documentation is also available online after you login to the developer site. If you have forgotten your username and/or password for the developer section of the website, send me a Private message on the forums with your registered Name, email address, and Product ID.
If you are not a registered developer and would like to become one. You can visit the following link:
https://www.iqfeed.net/dev/index.cfm?section=registerForm or contact our sales department.