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

    Default: 0             Value: 0-13000

    Maximum time, in milliseconds, that the local station can delay
    acknowledging a received message if there is no data to send.

    The value of this characteristic is linked to the retransmit
    timer used on the remote station. A suggested value is between
    10% and 20% of that timer. However, the actual values you can use
    may be limited by the communications product.

    The default value indicates that no holdback is used and the
    local station must acknowledge immediately.

    set [node node-id] ddcmp link link-name -
        logical station station-name -
        holdback timer integer

    Example:

    set ddcmp link ddcmp-0 logical station ddcmp-0 -
        holdback timer 0