Hi BassKahuna, first of all Welcome to WebmasterWorld!
Apache and IIS are differently organized. In Apache all settings are controlled via the httpd.conf and .htaccess files. In IIS part of the settings are controlled by the operating system.
If you want to apply rewrite rules to URLs, the most Apache-compatible solution is to use ISAPI Rewrite. Authentication which is also controlled by the .htaccess file in Apache is controlled in ASP by the web config file. More information about that can be found here