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

 event-name

    Specifies the name of an event for which event markers should
    be recorded. The event name must consist of one or more letters,
    digits, underscores, and dollar signs. It cannot begin with a
    digit.

 nodespec

    Specifies a node specification. When this program location is
    executed, an event marker for the event-name event is recorded in
    the performance data file.

    See HELP NODESPECS for more information on node specifications.