event-name

    Specifies the name of an event for which event markers will
    be canceled. This event name must have been established with a
    previous SET EVENT command.

 nodespec

    Specifies a node specification already associated with the event-
    name event through a previous SET EVENT command. The CANCEL EVENT
    command breaks the association between this node specification
    and the event-name event.

    See HELP NODESPECS for more information on node specifications.