VMS Help  —  Ext File Specs, Overview  Considerations  User Support
    When you enable ODS-5 volumes on an OpenVMS cluster, you should
    make users aware of the following characteristics:

    o  Extended file names caooonot be used on ODS-2 volumes.

    o  Case is determined by the first instance of an extended file
       name.

    o  There are special rules for case preservation and case
       blindness when using extended file names.

    o  Some system utilities and DCL commands have a /STYLE qualifier
       to control the display of file names.

    o  Error messages can vary when different parse style are used.

    o  Extended file names are not visible from a VAX system.

    The OpenVMS System Manager's Manual, Volume 1: Essentials
    contains information for setting user's expectations of Extended
    File Specifications.
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