Getting user input?

Please forgive my ignorance: I'm a newbie. I'm trying to create an installer that prompts a user for input, then creates a hostname based on that input and writes the info the the registry. I'm trying with MUI_INSTALLOPTIONS_DISPLAY and MUI_INSTALLOPTIONS_READ, but to no avail. Any input would be appreciated.

You need to create an IO ini file.
Look at example INI files in the Contrib\InstallOptions directory, along with Readme.html

-Stu