1.3 Overview
The Remote Mailslot Protocol is a simple, unreliable, insecure, and unidirectional interprocess communications (IPC) protocol between a client and server or among a group of servers that use the NetBIOS datagram service (as specified in [RFC1001] section 17) as the transport protocol. A mailslot server creates a mailslot, and a mailslot client writes messages to the mailslot created by the server. The server then reads these messages, thus achieving communication between the client and server applications. If the server closes the mailslot, the client will no longer be able to send messages to this mailslot.
This protocol specifies a means of carrying SMB_COM_TRANSACTION messages (as specified in section 2.2.1) over a NetBIOS datagram service. The sender of the mailslot message formats the SMB_COM_TRANSACTION message and sends it as a NetBIOS datagram. This protocol is not transported over SMB.