Further Research
DSI is never documented separately, and is sufficiently simple and static that older references are suitable for modern implementations. The concepts of DSI are identical to AppleTalk Session Protocol (ASP), and the overview in Inside AppleTalk, Second Edition can be helpful.
The most succinct guide is the "AFP over TCP" chapter of Apple Filing Protocol Programming Guide.
A significant source of information in understanding DSI can be found by analyzing communication between AFP clients and servers using a packet sniffer.
Read more about this topic: Data Stream Interface
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