3.2.1.2 Unacknowledged Frames

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The Unacknowledged Frames ADM element contains a list of logical frames (each represented by a frame ID) that have been sent to the client but that have not yet been acknowledged by the RDPGFX_FRAME_ACKNOWLEDGE_PDU (section 2.2.2.13) message. Logical frames are delineated by the RDPGFX_START_FRAME_PDU (section 2.2.2.11) and RDPGFX_END_FRAME_PDU (section 2.2.2.12) messages.