{}
{  The purpose of this request is to write a tapemark on magnetic tape.
{}
{       IOP$WRITE_TAPEMARK (SYSTEM_FILE_ID, IO_ID, STATUS)
{}
{ SYSTEM_FILE_ID: (input) This parameter specifies the system
{       file identification of the file.
{}
{ IO_ID: (output) This parameter specifies the identifier of this I/O
{       request.  The identifier is needed to determine the status of
{        the I/O request.
{}
{ STATUS: (output) This parameter specifies the request status.
{       Condition:
{               ioc$improper_sequence
{               ioc$improper_system_file_id
{               ioc$os_failure
{       Identifier: ioc$physical_io.
{}


