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

    Default: 2000		Value: 1-65535

    Maximum number of receive buffers that can store received transport
    PDUs. You may not decrease the value while NSP is enabled.

    set [node node-id] nsp maximum receive buffers integer

    Example:

    set nsp maximum receive buffers 4000