Different versions of the MSXML parser may be run in either side-by-side or replace mode.If you run the MSXML parser in side-by-side mode, newer versions of the parser do not replace older versions on your computer. This installation option does not alter the behavior of XML code that is written for earlier versions of MSXML. For example, different versions of the Microsoft Windows operating system and Microsoft Internet Explorer are released with different versions of MSXML. If they are installing a parser in side-by-side mode, developers who have created solutions that are based on earlier versions of MSXML can download a parser without destabilizing their existing XML code. To address a particular version of the parser, code should include version-dependent ProgIDs.
