MMS$TARGET            $@    The current target
    MMS$TARGET_NAME       $*    The current target (excluding file type)
    MMS$SOURCE            $<    The source file specification
    MMS$SOURCE_LIST       $+    Comma-separated list of all sources
    MMS$CHANGED_LIST      $?    Comma-separated list of sources that are
                                newer than the current target
    MMS$TARGET_SPEC       $>    The current target

    If the target is a module in an OpenVMS library...
    MMS$LIB_ELEMENT       $%    Element spec (i.e., module=alias)
    MMS$TARGET            $@    The library file specification
    MMS$TARGET_NAME       $*    The module name
    MMS$TARGET_SPEC       $>    The library file specification

    If the source is a CMS element...
    MMS$CMS_ELEMENT       $<    The CMS element
    MMS$CMS_GEN           $&    The CMS generation
    MMS$CMS_LIBRARY       $@    The CMS library specification