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3.2.5.1.6 Processing a Window Region Update PDU

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The receiver of the Window Region Update PDU (OD_WND_REGION_UPDATE) (section 2.2.3.7) MUST first validate the common header for consistency (section 3.1.5.1). If the PDU size is not long enough to contain all the fields in the message, the connection SHOULD be terminated.<16>

Receipt of this PDU indicates that the application window size has changed. The PDU is stateless and has no sequencing rules.