3.2.1.4 Persistent Bitmap Cache
A Persistent Bitmap Cache is a store that contains bitmap images that were sent to the client by using the Cache Bitmap - Revision 2 (section 2.2.2.2.1.2.3) or Cache Bitmap - Revision 3 (section 2.2.2.2.1.2.8) Secondary Drawing Order. Unlike the Bitmap Cache described in section 3.2.1.3, a Persistent Bitmap Cache is not bound to the lifetime of a given RDP connection and its contents are persisted even after the RDP connection is closed.