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

    Default: 1             Value: 1-255

    Specifies the maximum number of data messages that the local
    station can send without receiving an acknowledgment. This
    characteristic applies only when the remote station is a control
    station or on a half-duplex, point-to-point link. The value of
    this characteristic must be less than or equal to the equivalent
    of the maximum transmit characteristic on the control station or
    remote station.

    set [node node-id] ddcmp link link-name -
        logical station station-name -
        transmit window integer

    Example:

    set ddcmp link ddcmp-0 logical station ddcmp-0 -
        transmit window 127