Library /sys$common/syshlp/SCA$NEUTRAL_HELP.HLB  —  SCA Topics, Glossary  hidden_modules
    A module in one of the libraries in the current library list which
    is also present in a library which is earlier in the library list.
    The module in the earlier library is visible. The same module in
    any later library is a hidden module, hidden by the first module.
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