{
{   The purpose of this request is to check for completion of a specific
{ no_wait request issued for a file opened with amc$physical access. The}
{ BUFFER_AREA address used when the no_wait request was submitted is used}
{ to differentiate from among what may be multiple, outstanding requests.}
{   The STATUS variable will be set to abnormal if the request has completed}
{ with a data transfer error or if the request was never issued.}
{   If the request is incomplete, the contents of the transfer_count and}
{ byte_address parameters will be unchanged.}
{   The WAIT parameter may be used to await the completion of a specific}
{ request. If set to osc$nowait this request must be reissued until the}
{ sought after request completes.}
{
{       AMP$CHECK_BUFFER (FILE_IDENTIFIER, BUFFER_AREA, REQUEST_COMPLETE,
{         TRANSFER_COUNT, BYTE_ADDRESS, WAIT, STATUS)
{
{ FILE_IDENTIFIER: (input) This parameter specifies the file access
{       identifier established when the file was opened.
{
{ BUFFER_AREA: (input) This parameter specifies the user's buffer area
{       associated with the request to be checked.
{
{ REQUEST_COMPLETE: (output) This parameter specifies whether the request
{       defined by the buffer_area address has completed.
{
{ TRANSFER_COUNT: (output) This parameter specifies the number of bytes
{       actually transferred to the buffer_area by the request.
{
{ BYTE_ADDRESS: (output) This parameter specifies the file byte address
{       of the beginning of the transfer which has completed.
{
{ WAIT: (input) This parameter specifies the action to be taken if the
{       indicated physical input/output request on the file is not complete.
{       Options include:
{         wait: Don't return control until the request is complete.
{         nowait: Return control to the user even though the request may
{                 not be complete.  Another CHECK_BUFFER request must be
{                 used to determine completion.
{
{ STATUS: (output) This parameter specifies the request status.
{       CONDITION:  ame$ring_validation_error,
{       IDENTIFIER: amc$access_method_id.
{

