User`s guide

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byte. For destination/origin connections, the 8-byte header supplied in the Read or Write structured
fields data buffer is stripped and 9 bytes are then prefixed to the data. The application should compare
the size of the actual data in the data buffer (not including the 8-byte header) to the buffer size returned
from the Query Communications Buffer Size (122) function minus 9 bytes.
The maximum buffer sizes represent the maximum number of bytes supported by the PS hardware,
and the maximum number of bytes supported by the emulator. The application may use the maximum
buffer size only if the host system is also configured to accept that size.
The optimum buffer sizes represent the optimal number of bytes supported by both the PC hardware,
and the emulator.
If the network configuration sets transmission limits smaller than the optimum buffer size values, the
Query Communications Buffer Size (122) call reflects the data transfer buffer size from the current
configuration profile.