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In the client-server mode all I/O is performed by the server. The calls described here are used by the client to issue instructions to the server. In local mode the calls are performed locally. This is true for many DSPACK calls, however - it is important to realize the implications for the I/O operations - for instance - if the client 'opens' a file and then exits - the file stays open and positioned where the client left it. Another client may 'read' from this file (or 'write' to this file). This is because 'open' 'read' 'write' etc. are in fact commands to the server to do things.