BNETDocs
C>S 0x21 SID_DISPLAYAD
Message Id:0x21
Message Name:SID_DISPLAYAD
Direction:Client to Server
Used By:(nothing or unknown)
Format:

(UINT32) Platform ID
(UINT32) Product ID
(UINT32) Ad ID
(STRING) Filename
(STRING) URL 

Remarks

Sent when an ad is displayed. Perhaps for statistics?

Null strings are now sent in place of Filename and URL, since the need to truncate long strings to 128 characters was causing inaccuracies.

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