{
{    This request is used to check for completion of subsystem io requests.
{  Upon completion of this request, the pp response associated with each
{  completed subsystem io request, is available in the response area
{  associated with the subsystem io request.
{
{      CMP$CHECK_INITIATED_IO_STATUS (IO_STATUS_P, INDEX, STATUS)
{
{  IO_STATUS_P: (input,output)  This parameter is a pointer to a list of
{                               subsystem io request ids and their associated
{                               completion status.  A NIL pointer implies an
{                               io status check will be made for all subsystem
{                               io requests known to the job.
{
{  INDEX: (output)  This parameter specifies the index of the first subsystem io
{                   request id in the list that has a completed io status.  A value
{                   of 0 implies no subsystem io request has a completed io
{                   status.  IF io_status_p was NIL, this index will be non-
{                   zero if any subsystem io request has a completed io status.
{
{  STATUS: (output)  This parameter returns the request status.
{
