Library /sys$common/syshlp/nclhelp.hlb set, session_control, maintain_backward_soft_links  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    Default: False         Value: True or false

    Specifies whether Session Control should attempt to update
    the backward translation soft links when it detects an address
    change. If this attribute is set to false, Session Control will
    add no new backward translation soft links and it may delete any
    that it has created.

    Example:

    set session control maintain backward soft links true