18.104.22.168.2 Sending of the Offscreen Bitmap Cache Error PDU
The Offscreen Bitmap Cache Error PDU SHOULD be sent to a server when the creation of an offscreen bitmap in the Offscreen Bitmap Cache (see section 22.214.171.124.5) cannot be fulfilled due to a client-side failure (for example, low memory conditions).
Creation of an offscreen bitmap is accomplished by using the Create Offscreen Bitmap (section 126.96.36.199.1.3.2) Alternate Secondary Drawing Order. The client SHOULD send the Offscreen Bitmap Cache Error PDU to the server to request that it disable offscreen bitmap caching and resend the drawing updates associated with the affected area. Any further errors related to the offscreen bitmap caching MUST be ignored by the client.
The structure and fields of the Offscreen Bitmap Cache Error PDU are specified in section 188.8.131.52.2, and the techniques described in [MS-RDPBCGR] section 184.108.40.206 demonstrate how to initialize the contents of the PDU. The contents of this PDU MAY be compressed.