For a Windows 2000 version of this article, see What are the switch options for the Windows 2000 Boot.ini file?
Microsoft Knowledge Base Article 833721 contains the following summary:
You can add many different switches to the Boot.ini file that will modify the way that Microsoft Windows XP or Microsoft Windows Server 2003 start.
For additional information, click the following article number to view the article in the Microsoft Knowledge Base:
102873 Boot.ini and ARC path naming conventions and usage