VMS Help DECTPU, TPU$SIGNAL, Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 condition-code

    OpenVMS usage: cond_value
    type:          longword (unsigned)
    access:        read only
    mechanism:     by value
    The condition-code is an unsigned longword that contains the
    condition code to be signaled. In most cases, this argument is a
    TPU message code.