Thanks to Aaron Parker for sending this info in.
HFNetChk is a command-line tool that enables an administrator to assess patch status for computers that are running Windows NT 4.0, Windows 2000, and Windows XP, as well as hotfixes for Internet Information Server 4.0 (IIS), Internet Information Services 5.0 (IIS), SQL Server 7.0, SQL Server 2000 (including Microsoft Data Engine [MSDE]), and Internet Explorer 5.01 or later. Version 3.31 is an updated version of 3.3 that will properly identify SQL Server 7.0 systems.
Note: An XML parser is required on each computer that runs HFNetChk. A parser is included with Internet Explorer 5 and later. However, if you are running an earlier version of Internet Explorer and you cannot install Internet Explorer 5 or later, you can download and install a standalone version of the XML parser (version 4) from the following location: