code: public final void setSecurityUserid(String value) {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "setSecurityUserid", value);
          jmo.setField(JsHdrAccess.SECURITYUSERID, value);
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "setSecurityUserid");
      }
docs: /*
  Set the contents of the SecurityUserid field in the message header.
  
  Javadoc description supplied by JsMessage interface.