3.3.5.2 Redirection Object Lifetime Management
Logical surface and redirection surface are two types of objects used by the Desktop Window Manager. The objects are allocated on the server, and their handles are sent to the client and used by the compositor on the client to access the surface data and properties from the surface manager proxy.
The protocol extension that is specified here is responsible for remoting the handle values to the client. The remote protocol keeps the lifetime and association of the proxy redirection objects on the client in sync with their corresponding redirection surface on the server.