This read-write Integer32 (1-64) is the maximum number of RUDP segments that may be sent without receiving an acknowledgment, defining the maximum receive-window size in segments for flow control. An admin cares because this window size affects throughput and how aggressively the sender can push data before waiting for acks, a classic flow-control tuning parameter. For example, an operator seeing sluggish signaling throughput over a high-latency link might increase this window size to allow more unacknowledged segments in flight.