VMS Help Sys Parameters, WS_OPA0  *Conan The Librarian (sorry for the slow response - running on an old VAX)

    (VAX only) WS_OPA0 enables OPA0 output to the QVSS screen for
    a workstation. A value of 1 enables output for OPA0 to the QVSS
    screen; a value of 0 causes output for OPA0 to be ignored.