The logical names RDMS$BIND_VM_SEGMENT changed to RDM$BIND_
    VM_SEGMENT, that is, without the S. This logical name prevents
    memory fragmentation and allows certain applications which would
    otherwise run out of virtual memory to execute correctly.

                                   NOTE

       The RDM$BIND_VM_SEGMENT logical name is not for general
       use, as preserving larger block sizes (by preventing
       fragmentation) may cause problems for some applications.

    To use this logical name use the DCL command as follows:

    $ DEFINE RDM$BIND_VM_SEGMENT 1

    Use this logical name either on the system experiencing the
    problem or in some other appropriate place such as in the
    LOGIN.COM file of the users experiencing the difficulty.