User guide

2: Freeway Client-Server Protocol
DC 900-1303C 31
2.3 Freeway Packet Header Formats
Several headers precede ICP data in packets exchanged between the client and the
server. This design supports the DLI and TSI. The design also includes headers used by
protocol client applications and the ICP-resident protocol logic. Note that applications
that use the TSI do not include a pointer to the TSI header in buffers passed to the TSI
tRead or tWrite routine. The TSI builds this header in the storage area immediately pre-
ceding the buffer pointer passed in the
tRead or tWrite call. (Buffer management is
described in the Freeway Transport Subsystem Interface Reference Guide).
The following sections describe the header formats.