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3.3.5.1.1 Processing the Show Window PDU

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The receiver of the Show Window PDU (OD_WND_SHOW) (section 2.2.3.6) MUST verify 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.<25>

The WndId field in the PDU MUST specify the window that the participant wants to view. The sharing manager SHOULD <26> validate the WndId field against the existing windows and SHOULD <27> verify that the participant is entitled to make that request before granting it.