Library /sys$common/syshlp/decset$envmgr.hlb cgui, dd options PopForm, cms class Txt  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 Specify the CMS class to direct MMS to use the macro definition
 "CMSFLAGS=GENERATION=class-name".  By specifying a CMS class, MMS
 still uses the CMS elements as the sources but it uses the designated
 class of generations, not necessarily the current generations.