3.2.1.14 Persistent Bitmap Caches
A Persistent Bitmap Cache is a store that contains bitmap images that were sent to the client by using the Cache Bitmap (Revision 2) Secondary Drawing Order ([MS-RDPEGDI] section 2.2.2.2.1.2.3). Unlike the Bitmap Caches described in section 3.2.1.13, Persistent Bitmap Caches are not bound to the lifetime of a given RDP connection and their contents are persisted even after the RDP connection is closed.