The release notes for PCA are located in SYS$HELP:PCAvvu.RELEASE_
    NOTES (ASCII text) and SYS$HELP:PCAvvu_RELEASE_NOTES.PS
    (postscript), where 'vv' represents the major version number
    and 'u' the minor version number. For example, the filename for
    the PCA V4.7 release notes is 'PCA047.RELEASE_NOTES'.