The PCONTEXT_HANDLE_TYPE is an RPC context handle type. This type is used to identify a directory query result set. See S_DSLookupBegin.

An RPC context handle specifies the information necessary to enable the RPC subsystem on the server to keep state information on a per-session basis and to do resource cleanup if the session is broken and the client cannot close the connection in an orderly manner. RPC context handles are as specified in [C706] section 6.1.6.

 typedef [context_handle] void* PCONTEXT_HANDLE_TYPE;