/sys$common/syshlp/HELPLIB.HLB  —  CRTL  Feature Logical Names, DECC$MAILBOX_CTX_STM
    By default, an open on a local mailbox that is not a pipe treats
    mailbox records as having a record attribute of FAB$M_CR.

    With DECC$MAILBOX_CTX_STM enabled, the record attribute FAB$M_CR
    is not set.
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