Add comments and session

network/tunnel/tunnel.go

@@ -20,15 +20,19 @@ type Tunnel interface {
 	Listen(addr string) (Listener, error)
 }
 
+// The listener provides similar constructs to the transport.Listener
 type Listener interface {
 	Addr() string
 	Close() error
 	Accept() (Conn, error)
 }
 
+// Conn is a connection dialed or accepted which includes the tunnel id and session
 type Conn interface {
 	// Specifies the tunnel id
 	Id() string
+	// The session
+	Session() string
 	// a transport socket
 	transport.Socket
 }