Whenever ITP/Document Services encounters a SendFile or ReceiveFile instruction, it will either send the contents of a file to the specified queue, or retrieve a message from the specified queue and store it in a file. See the description of these commands for details.
Note that ITP/Server does not request the client for particular file transfers as was the case in ITP/Document Services. This form of interaction would be incompatible under syncpoint control, as this prevents request messages to arrive at the client before the entire job ends. Instead, the client must ensure that it puts all data on one or more queues at the start of the job. Only after the job has ended (and committed) the client will be able to read back result data.
If intermediate interaction with the client is required, we advise to split up a job, in to several transactions.