2.2.1.3.1.1 Common Header (TS_WINDOW_ORDER_HEADER)

The TS_WINDOW_ORDER_HEADER packet contains information common to every Windowing Alternate Secondary Drawing Order describing a window.

0	1	2	3	4	5	6	7	8	9	1 0	1	2	3	4	5	6	7	8	9	2 0	1	2	3	4	5	6	7	8	9	3 0	1
Header								OrderSize																FieldsPresentFlags
...																								WindowId
...

Header (1 byte): An unsigned 8-bit integer. An Alternate Secondary Order Header, as specified in [MS-RDPEGDI] section 2.2.2.2.1.3.1.1. The embedded orderType field MUST be set to 0x0B (TS_ALTSEC_WINDOW).

OrderSize (2 bytes): An unsigned 16-bit integer. The size of the entire packet, in bytes.

FieldsPresentFlags (4 bytes): An unsigned 32-bit integer. The flags indicating which fields are present in the packet. See Orders.

WindowId (4 bytes): An unsigned 32-bit integer. The ID of the window being described in the drawing order. It is generated by the server and is unique for every window in the session.