Library /sys$common/syshlp/scacp$help.hlb SET, TRACE, Parameters  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 nodename[,nodename1,nodename2,...]

    Includes channels and VCs to specific nodes, which you can use
    wildcards to specify. Each node name can be accompanied by
    optional qualifiers to specify local and remote device names.
    If no local or remote device name is specified, all channels
    associated with the specified node are included, as well as the
    VC to the specified node.

    Use the SHOW CHANNEL command to display node names and local and
    remote device names.