diff --git a/include/ntapi/nt_tty.h b/include/ntapi/nt_tty.h
index f0d7c5d..fd41753 100644
--- a/include/ntapi/nt_tty.h
+++ b/include/ntapi/nt_tty.h
@@ -55,6 +55,7 @@ typedef enum _nt_tty_opcode {
 	NT_TTY_CLIENT_PROCESS_UNREGISTER,
 	/* session information */
 	NT_TTY_QUERY_INFORMATION_SERVER,
+	NT_TTY_QUERY_INFORMATION_SERVICE,
 	NT_TTY_QUERY_INFORMATION_SESSION,
 	NT_TTY_QUERY_INFORMATION_PROCESS,
 	NT_TTY_QUERY_INFORMATION_THREAD,
@@ -159,6 +160,14 @@ typedef struct __attr_ptr_size_aligned__ _nt_tty_server_info {
 	uintptr_t			info_buffer[];
 } nt_tty_server_info;
 
+
+typedef struct __attr_ptr_size_aligned__ _nt_tty_service_info {
+	nt_port_attr	attr;
+	uint32_t	key;
+	uint32_t	id;
+} nt_tty_service_info;
+
+
 typedef struct __attr_ptr_size_aligned__ _nt_tty_vms_info {
 	void *		hroot;
 	uint32_t	hash;
@@ -272,6 +281,15 @@ typedef struct __attr_ptr_size_aligned__ _nt_tty_server_msg {
 } nt_tty_server_msg;
 
 
+typedef struct __attr_ptr_size_aligned__ _nt_tty_service_msg {
+	nt_port_message			header;
+	struct {
+		nt_tty_msg_info		ttyinfo;
+		nt_tty_service_info	svcinfo;
+	} data;
+} nt_tty_service_msg;
+
+
 typedef struct __attr_ptr_size_aligned__ _nt_tty_vms_msg {
 	nt_port_message			header;
 	struct {
@@ -356,6 +374,7 @@ typedef struct __attr_ptr_size_aligned__ _nt_tty_port_msg {
 		nt_pty_io_info		ioinfo;
 		nt_pty_client_info	clientinfo;
 		nt_tty_session_info	sessioninfo;
+		nt_tty_service_info	svcinfo;
 		nt_sem_info		seminfo;
 	};
 } nt_tty_port_msg;
@@ -427,6 +446,15 @@ typedef int32_t __stdcall ntapi_tty_query_information_server(
 	__in	int			tty_info_class);
 
 
+typedef int32_t __stdcall ntapi_tty_query_information_service(
+	__in	void *			hport,
+	__out	nt_io_status_block *	iosb,
+	__out	nt_tty_service_info *	svcinfo,
+	__in	const nt_guid *		guid,
+	__in	uint32_t		key,
+	__in	uint32_t		id);
+
+
 /* pty api */
 typedef struct nt_pty_context nt_pty;
 
diff --git a/include/ntapi/ntapi.h b/include/ntapi/ntapi.h
index a3d514e..c2ff0e5 100644
--- a/include/ntapi/ntapi.h
+++ b/include/ntapi/ntapi.h
@@ -530,6 +530,7 @@ typedef struct _ntapi_vtbl {
 	ntapi_tty_client_session_set *			tty_client_session_set;
 	ntapi_tty_client_process_register *		tty_client_process_register;
 	ntapi_tty_query_information_server *		tty_query_information_server;
+	ntapi_tty_query_information_service *		tty_query_information_service;
 	ntapi_tty_request_peer *			tty_request_peer;
 	ntapi_tty_vms_query *				tty_vms_query;
 	ntapi_tty_vms_request *				tty_vms_request;
diff --git a/project/common.mk b/project/common.mk
index e04e1f3..c1b5b1b 100644
--- a/project/common.mk
+++ b/project/common.mk
@@ -99,6 +99,7 @@ COMMON_SRCS = \
 	src/tty/ntapi_tty_create_session.c \
 	src/tty/ntapi_tty_join_session.c \
 	src/tty/ntapi_tty_query_information_server.c \
+	src/tty/ntapi_tty_query_information_service.c \
 	src/tty/ntapi_tty_request_peer.c \
 	src/tty/ntapi_tty_vms_query.c \
 	src/tty/ntapi_tty_vms_request.c \
diff --git a/src/internal/ntapi.c b/src/internal/ntapi.c
index 12ef163..336b5db 100644
--- a/src/internal/ntapi.c
+++ b/src/internal/ntapi.c
@@ -305,6 +305,7 @@ static int32_t __fastcall __ntapi_init_once(ntapi_vtbl ** pvtbl)
 	__ntapi->tty_client_session_set				= __ntapi_tty_client_session_set;
 	__ntapi->tty_client_process_register			= __ntapi_tty_client_process_register;
 	__ntapi->tty_query_information_server			= __ntapi_tty_query_information_server;
+	__ntapi->tty_query_information_service			= __ntapi_tty_query_information_service;
 	__ntapi->tty_request_peer				= __ntapi_tty_request_peer;
 	__ntapi->tty_vms_query					= __ntapi_tty_vms_query;
 	__ntapi->tty_vms_request 				= __ntapi_tty_vms_request;
diff --git a/src/internal/ntapi_fnapi.h b/src/internal/ntapi_fnapi.h
index 84a8e59..546c335 100644
--- a/src/internal/ntapi_fnapi.h
+++ b/src/internal/ntapi_fnapi.h
@@ -193,6 +193,7 @@ ntapi_tty_client_session_query			__ntapi_tty_client_session_query;
 ntapi_tty_client_session_set			__ntapi_tty_client_session_set;
 ntapi_tty_client_process_register		__ntapi_tty_client_process_register;
 ntapi_tty_query_information_server		__ntapi_tty_query_information_server;
+ntapi_tty_query_information_service		__ntapi_tty_query_information_service;
 ntapi_tty_request_peer				__ntapi_tty_request_peer;
 ntapi_tty_vms_query				__ntapi_tty_vms_query;
 ntapi_tty_vms_request				__ntapi_tty_vms_request;
diff --git a/src/tty/ntapi_tty_query_information_service.c b/src/tty/ntapi_tty_query_information_service.c
new file mode 100644
index 0000000..e3ea8b5
--- /dev/null
+++ b/src/tty/ntapi_tty_query_information_service.c
@@ -0,0 +1,55 @@
+/********************************************************/
+/*  ntapi: Native API core library                      */
+/*  Copyright (C) 2013--2017  Z. Gilboa                 */
+/*  Released under GPLv2 and GPLv3; see COPYING.NTAPI.  */
+/********************************************************/
+
+#include <psxtypes/psxtypes.h>
+#include <ntapi/nt_tty.h>
+#include <ntapi/nt_guid.h>
+#include <ntapi/ntapi.h>
+#include "ntapi_impl.h"
+
+int32_t	__stdcall __ntapi_tty_query_information_service(
+	__in	void *			hport,
+	__out	nt_io_status_block *	iosb,
+	__out	nt_tty_service_info *	svcinfo,
+	__in	const nt_guid *		guid,
+	__in	uint32_t		key,
+	__in	uint32_t		id)
+{
+	int32_t			status;
+	nt_tty_service_msg	msg;
+
+	__ntapi->tt_aligned_block_memset(
+		&msg,0,sizeof(msg));
+
+	msg.header.msg_type		= NT_LPC_NEW_MESSAGE;
+	msg.header.data_size		= sizeof(msg.data);
+	msg.header.msg_size		= sizeof(msg);
+	msg.data.ttyinfo.opcode		= NT_TTY_QUERY_INFORMATION_SERVICE;
+	msg.data.svcinfo.key		= key;
+	msg.data.svcinfo.id		= id;
+
+	__ntapi->tt_guid_copy(
+		&msg.data.svcinfo.attr.guid,
+		guid);
+
+	if (!hport)
+		hport = __ntapi_internals()->hport_tty_session;
+
+	if ((status = __ntapi->zw_request_wait_reply_port(hport,&msg,&msg)))
+		return status;
+	else if (msg.data.ttyinfo.status)
+		return msg.data.ttyinfo.status;
+
+	__ntapi->tt_generic_memcpy(
+		svcinfo,
+		&msg.data.svcinfo,
+		sizeof(*svcinfo));
+
+	iosb->status = NT_STATUS_SUCCESS;
+	iosb->info   = sizeof(*svcinfo);
+
+	return NT_STATUS_SUCCESS;
+}