Version M.m of XSI contains two major enhancements. First, XSI now provides a mechanism which allows an embedded application to create multiple environments into which programs can be loaded. Second, an improved Windows 95/98/NT XSI interface is now available and the Macintosh XSI interface has been enhanced to support MacOS X. For a detailed listing of differences between the 6.x releases, refer to appendix B of the Basic Programming Guide and appendix C of the Advanced Programming Guide.