diff --git a/CMakeLists.txt b/CMakeLists.txt
index e84548d..ddcba93 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -43,8 +43,8 @@ add_executable(
     dependencies/minIni/dev/minIni.c
     dependencies/getopt-for-windows/getopt.h
     dependencies/getopt-for-windows/getopt.c
-    src/packages/game/output/IZ_video.h
-    src/packages/game/output/IZ_video.c
+        src/packages/game/output/video/IZ_video.h
+        src/packages/game/output/video/IZ_video.c
     src/packages/game/IZ_common.h
     src/packages/game/input/IZ_action.h
     src/packages/game/IZ_app.h
@@ -84,7 +84,7 @@ add_executable(
     src/packages/game/util/IZ_midi.h
     src/packages/game/net/core/IZ_websocket.h
     src/packages/game/net/core/IZ_websocket.c
-        src/packages/game/net/IZ_net.c src/packages/game/net/IZ_net.h src/packages/game/net/IZ_app.c src/packages/game/net/IZ_app.h)
+        src/packages/game/net/IZ_net.c src/packages/game/net/IZ_net.h src/packages/game/net/IZ_app.c src/packages/game/net/IZ_app.h src/packages/game/output/video/IZ_app.c src/packages/game/output/video/IZ_app.h src/packages/game/IZ_subsystem.c src/packages/game/IZ_subsystem.h src/packages/game/input/IZ_app.c src/packages/game/input/IZ_app.h)
 
 target_link_libraries(
   game
@@ -153,8 +153,8 @@ add_executable(
 
     src/packages/game/IZ_config.h
 
-    src/packages/game/output/IZ_video.h
-    src/packages/game/output/IZ_video.c
+        src/packages/game/output/video/IZ_video.h
+        src/packages/game/output/video/IZ_video.c
     src/packages/game/output/output.test.c
 )
 
diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..d1a8868
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,3 @@
+- [ ] Authentication server, using HTTP dynamic content
+  - [ ] server
+  - [ ] client (frontend)
diff --git a/src/packages/game/IZ_app.c b/src/packages/game/IZ_app.c
index 4d7e06a..916e029 100644
--- a/src/packages/game/IZ_app.c
+++ b/src/packages/game/IZ_app.c
@@ -65,189 +65,6 @@ void IZ_AppTeardown(struct IZ_App* app) {
 	SDL_Quit();
 }
 
-IZ_ProcedureResult IZ_AppHandleSDLEvents(struct IZ_App* app) {
-	SDL_Event e;
-	while (SDL_PollEvent(&e) != 0) {
-		if (e.type == SDL_QUIT) {
-			return 1;
-		}
-
-		if (e.type == SDL_KEYDOWN) {
-			if (e.key.keysym.sym == SDLK_PAGEUP) {
-				IZ_NetConnect(
-					&app->net_state,
-					(IZ_WSClientInitializeParams) {
-						.host = "127.0.0.1",
-						.path = "/",
-						.port = 42069,
-					}
-				);
-			} else if (e.key.keysym.sym == SDLK_PAGEDOWN) {
-				IZ_NetDisconnect(&app->net_state);
-			} else if (e.key.keysym.sym == SDLK_INSERT) {
-				IZ_NetSendTextMessage(&app->net_state, "hello", 5);
-			}
-		}
-
-		IZ_InputHandleSDLEvents(&app->input_state, e);
-	}
-	return 0;
-}
-
-void IZ_AppHandlePortMIDIEvents(struct IZ_App* app) {
-	u8 player_index;
-	i32* midi_events_count;
-	u32 midi_event_index;
-	for (player_index = 0; player_index < IZ_PLAYERS; player_index += 1) {
-		if (!app->input_state.midi_input_state[player_index].device_info) {
-			continue;
-		}
-
-		midi_events_count = &app->input_state.midi_input_state[player_index].midi_events_count;
-		*midi_events_count = Pm_Read(
-			app->input_state.midi_input_state[player_index].stream,
-			// TODO bind buffers and streams to device instead of player input state
-			app->input_state.midi_input_state[player_index].event_buffer,
-			1024
-		);
-
-		if (*midi_events_count < 1) {
-			continue;
-		}
-
-		for (midi_event_index = 0; midi_event_index < *midi_events_count; midi_event_index += 1) {
-			IZ_InputHandlePortMIDIEvents(
-				&app->input_state,
-				app->input_state.midi_input_state[player_index].event_buffer[midi_event_index]
-			);
-		}
-	}
-}
-
-IZ_ProcedureResult IZ_AppHandleInputEvents(struct IZ_App* app) {
-	i32 sdl_events_result = IZ_AppHandleSDLEvents(app);
-	if (sdl_events_result) {
-		return sdl_events_result;
-	}
-
-	IZ_AppHandlePortMIDIEvents(app);
-	return 0;
-}
-
-void IZ_VideoUpdateForDebugTicks(IZ_VideoState* video_state, uint64_t ticks) {
-	SDL_SetRenderDrawColor(video_state->renderer, 0x00, 0xff, 0xff, 0xff);
-	u64 the_ticks = ticks;
-	u8 column;
-	u8 row;
-	const u8 size = 4;
-
-	u8 i;
-	for (i = 0; i < 64; i += 1) {
-		column = i % 32;
-		row = i / 32;
-
-		if (the_ticks & 0x1) {
-			SDL_RenderFillRectF(video_state->renderer, &(SDL_FRect) {
-				(f32) (video_state->config.width - ((column + 1) * size)),
-				(f32) (video_state->config.height - ((row + 1) * size)),
-				size,
-				size
-			});
-		}
-		the_ticks >>= 1;
-	}
-}
-
-void IZ_VideoUpdateForDebugInput(IZ_VideoState* video_state, IZ_InputState* input_state) {
-	SDL_SetRenderDrawColor(video_state->renderer, 0xff, 0xff, 0x00, 0xff);
-	const u8 size = 4;
-
-	u8 column;
-	u8 row;
-
-	u8 p;
-	u8 i;
-	for (p = 0; p < IZ_PLAYERS; p += 1) {
-		IZ_Action the_action = input_state->action[p];
-		for (i = 0; i < CONTROLS; i += 1) {
-			column = (i % 4) + (p * 4);
-			row = i / 4;
-
-			if (the_action & 0x1) {
-				SDL_RenderFillRectF(video_state->renderer, &(SDL_FRect) {
-					(f32) (column * size),
-					(f32) (row * size),
-					size,
-					size
-				});
-			}
-			the_action >>= 1;
-		}
-	}
-}
-
-void IZ_VideoUpdateForDebugNet(IZ_VideoState* video_state, IZ_NetState* net_state) {
-	if (!net_state->ws.connection) {
-		return;
-	}
-	const u8 size = 4;
-
-	SDL_SetRenderDrawColor(video_state->renderer, 0x00, 0xff, 0x00, 0xff);
-	SDL_RenderFillRectF(video_state->renderer, &(SDL_FRect) {
-		0,
-		(f32) (video_state->config.height - size),
-		size,
-		size,
-	});
-
-	u8 column;
-	u8 row;
-
-	u8 p;
-	u8 i;
-	for (p = 0; p < IZ_PLAYERS; p += 1) {
-		IZ_Action the_action = net_state->action[p];
-		for (i = 0; i < CONTROLS; i += 1) {
-			column = (i % 4) + (p * 4);
-			row = i / 4;
-
-			if (the_action & 0x1) {
-				SDL_RenderFillRectF(video_state->renderer, &(SDL_FRect) {
-					(f32) (column * size),
-					(f32) ((row * size) + (video_state->config.height - (size * 5))),
-					size,
-					size
-				});
-			}
-			the_action >>= 1;
-		}
-	}
-}
-
-void IZ_VideoUpdateForDebug(IZ_VideoState* video_state, u64 ticks, IZ_InputState* input_state, IZ_NetState* net_state) {
-	IZ_VideoUpdateForDebugTicks(video_state, ticks);
-	IZ_VideoUpdateForDebugInput(video_state, input_state);
-	IZ_VideoUpdateForDebugNet(video_state, net_state);
-}
-
-void IZ_VideoUpdate(IZ_VideoState* video_state) {
-	struct IZ_App* app = video_state->user_data;
-	if (app->ticks - video_state->last_update_at > 1000 / video_state->config.max_fps) {
-		// Update window
-		SDL_SetRenderDrawColor(video_state->renderer, 0x00, 0x00, 0x00, 0xff);
-		SDL_RenderClear(video_state->renderer);
-		for (u8 i = 0; i < MAX_ACTIVE_SPRITES; i += 1) {
-			if (!video_state->active_sprites[i]) {
-				continue;
-			}
-			// TODO draw sprites
-		}
-		IZ_VideoUpdateForDebug(video_state, app->ticks, &app->input_state, &app->net_state);
-		SDL_RenderPresent(video_state->renderer);
-		video_state->last_update_at = app->ticks;
-	}
-}
-
 IZ_ProcedureResult IZ_AppRun(struct IZ_App* app, u8 argc, const char* argv[]) {
 	IZ_ProcedureResult init_result = IZ_AppInitialize(app, argc, argv);
 	if (init_result) {
diff --git a/src/packages/game/IZ_app.h b/src/packages/game/IZ_app.h
index 4cae2dc..015655f 100644
--- a/src/packages/game/IZ_app.h
+++ b/src/packages/game/IZ_app.h
@@ -3,10 +3,10 @@
 
 #include <SDL.h>
 #include <libwebsockets.h>
-#include "input/IZ_input.h"
-#include "output/IZ_video.h"
 #include "memory/IZ_pool.h"
+#include "input/IZ_app.h"
 #include "net/IZ_app.h"
+#include "output/video/IZ_app.h"
 
 typedef enum {
 	IZ_APP_RUN_RESULT_OK,
diff --git a/src/packages/game/IZ_subsystem.c b/src/packages/game/IZ_subsystem.c
new file mode 100644
index 0000000..a56d0b9
--- /dev/null
+++ b/src/packages/game/IZ_subsystem.c
@@ -0,0 +1 @@
+#include "IZ_subsystem.h"
diff --git a/src/packages/game/IZ_subsystem.h b/src/packages/game/IZ_subsystem.h
new file mode 100644
index 0000000..66713fd
--- /dev/null
+++ b/src/packages/game/IZ_subsystem.h
@@ -0,0 +1,16 @@
+#ifndef IZ_SUBSYSTEM_H
+#define IZ_SUBSYSTEM_H
+
+#include "IZ_common.h"
+#include "net/IZ_net.h"
+#include "input/IZ_input.h"
+
+struct IZ_App;
+
+u64 IZ_AppGetTicks(struct IZ_App*);
+
+IZ_NetState* IZ_AppGetNetState(struct IZ_App*);
+
+IZ_InputState* IZ_AppGetInputState(struct IZ_App*);
+
+#endif
diff --git a/src/packages/game/input/IZ_app.c b/src/packages/game/input/IZ_app.c
new file mode 100644
index 0000000..44bd1a6
--- /dev/null
+++ b/src/packages/game/input/IZ_app.c
@@ -0,0 +1,74 @@
+#include "IZ_app.h"
+
+IZ_ProcedureResult IZ_AppHandleSDLEvents(struct IZ_App* app) {
+	SDL_Event e;
+	IZ_InputState* input_state = IZ_AppGetInputState(app);
+	IZ_NetState* net_state = IZ_AppGetNetState(app);
+
+	while (SDL_PollEvent(&e) != 0) {
+		if (e.type == SDL_QUIT) {
+			return 1;
+		}
+
+		if (e.type == SDL_KEYDOWN) {
+			if (e.key.keysym.sym == SDLK_PAGEUP) {
+				IZ_NetConnect(
+					net_state,
+					(IZ_WSClientInitializeParams) {
+						.host = "127.0.0.1",
+						.path = "/",
+						.port = 42069,
+					}
+				);
+			} else if (e.key.keysym.sym == SDLK_PAGEDOWN) {
+				IZ_NetDisconnect(net_state);
+			} else if (e.key.keysym.sym == SDLK_INSERT) {
+				IZ_NetSendTextMessage(net_state, "hello", 5);
+			}
+		}
+
+		IZ_InputHandleSDLEvents(input_state, e);
+	}
+	return 0;
+}
+
+void IZ_AppHandlePortMIDIEvents(struct IZ_App* app) {
+	IZ_InputState* input_state = IZ_AppGetInputState(app);
+	u8 player_index;
+	i32* midi_events_count;
+	u32 midi_event_index;
+	for (player_index = 0; player_index < IZ_PLAYERS; player_index += 1) {
+		if (!input_state->midi_input_state[player_index].device_info) {
+			continue;
+		}
+
+		midi_events_count = &input_state->midi_input_state[player_index].midi_events_count;
+		*midi_events_count = Pm_Read(
+			input_state->midi_input_state[player_index].stream,
+			// TODO bind buffers and streams to device instead of player input state
+			input_state->midi_input_state[player_index].event_buffer,
+			1024
+		);
+
+		if (*midi_events_count < 1) {
+			continue;
+		}
+
+		for (midi_event_index = 0; midi_event_index < *midi_events_count; midi_event_index += 1) {
+			IZ_InputHandlePortMIDIEvents(
+				input_state,
+				input_state->midi_input_state[player_index].event_buffer[midi_event_index]
+			);
+		}
+	}
+}
+
+IZ_ProcedureResult IZ_AppHandleInputEvents(struct IZ_App* app) {
+	i32 sdl_events_result = IZ_AppHandleSDLEvents(app);
+	if (sdl_events_result) {
+		return sdl_events_result;
+	}
+
+	IZ_AppHandlePortMIDIEvents(app);
+	return 0;
+}
diff --git a/src/packages/game/input/IZ_app.h b/src/packages/game/input/IZ_app.h
new file mode 100644
index 0000000..a6832c6
--- /dev/null
+++ b/src/packages/game/input/IZ_app.h
@@ -0,0 +1,8 @@
+#ifndef IZ_INPUT_APP_H
+#define IZ_INPUT_APP_H
+
+#include "../IZ_subsystem.h"
+
+IZ_ProcedureResult IZ_AppHandleInputEvents(struct IZ_App*);
+
+#endif
diff --git a/src/packages/game/net/IZ_app.h b/src/packages/game/net/IZ_app.h
index dedd8c5..a5a5ef1 100644
--- a/src/packages/game/net/IZ_app.h
+++ b/src/packages/game/net/IZ_app.h
@@ -1,14 +1,13 @@
 #ifndef IZ_NET_APP_H
 #define IZ_NET_APP_H
 
-#include "../IZ_common.h"
-#include "../input/IZ_input.h"
 #include "IZ_net.h"
+#include "../IZ_subsystem.h"
 
 typedef enum {
 	IZ_MESSAGE_KIND_ACTION_SYNC = 0,
 	IZ_MESSAGE_KIND_STATE_SYNC = 1,
-} IZ_MessageKind;
+} IZ_AppMessageKind;
 
 typedef struct {
 	u8 index: 3;
@@ -47,14 +46,8 @@ typedef struct {
 
 struct IZ_App;
 
-u64 IZ_AppGetTicks(struct IZ_App*);
-
 void IZ_AppBindConnection(struct IZ_App*, struct lws*);
 
-IZ_NetState* IZ_AppGetNetState(struct IZ_App*);
-
-IZ_InputState* IZ_AppGetInputState(struct IZ_App*);
-
 void IZ_AppHandleOutboundNetworking(struct IZ_App*);
 
 #endif
diff --git a/src/packages/game/output/output.test.c b/src/packages/game/output/output.test.c
index b087116..dfc68cc 100644
--- a/src/packages/game/output/output.test.c
+++ b/src/packages/game/output/output.test.c
@@ -1,7 +1,7 @@
 #include "../../../__mocks__/minIni.mock.h"
 #include "../../../__mocks__/SDL_stdinc.mock.h"
 #include "../../../__mocks__/SDL_render.mock.h"
-#include "IZ_video.h"
+#include "video/IZ_video.h"
 
 const char* IZ_ConfigGetCommandlineOption(u8 argc, const char* argv[], const char* val) {
 	size_t n = strlen(val);
diff --git a/src/packages/game/output/video/IZ_app.c b/src/packages/game/output/video/IZ_app.c
new file mode 100644
index 0000000..8e694f3
--- /dev/null
+++ b/src/packages/game/output/video/IZ_app.c
@@ -0,0 +1,116 @@
+#include "IZ_app.h"
+
+void IZ_VideoUpdateForDebugTicks(IZ_VideoState* video_state, uint64_t ticks) {
+	SDL_SetRenderDrawColor(video_state->renderer, 0x00, 0xff, 0xff, 0xff);
+	u64 the_ticks = ticks;
+	u8 column;
+	u8 row;
+	const u8 size = 4;
+
+	u8 bit_index;
+	for (bit_index = 0; bit_index < 64; bit_index += 1) {
+		column = bit_index % 32;
+		row = bit_index / 32;
+
+		if (the_ticks & 0x1) {
+			SDL_RenderFillRectF(video_state->renderer, &(SDL_FRect) {
+				(f32) (video_state->config.width - ((column + 1) * size)),
+				(f32) (video_state->config.height - ((row + 1) * size)),
+				size,
+				size
+			});
+		}
+		the_ticks >>= 1;
+	}
+}
+
+void IZ_VideoUpdateForDebugInput(IZ_VideoState* video_state, IZ_InputState* input_state) {
+	SDL_SetRenderDrawColor(video_state->renderer, 0xff, 0xff, 0x00, 0xff);
+	const u8 size = 4;
+
+	u8 column;
+	u8 row;
+
+	u8 player_index;
+	u8 control_index;
+	for (player_index = 0; player_index < IZ_PLAYERS; player_index += 1) {
+		IZ_Action the_action = input_state->action[player_index];
+		for (control_index = 0; control_index < CONTROLS; control_index += 1) {
+			column = (control_index % 4) + (player_index * 4);
+			row = control_index / 4;
+
+			if (the_action & 0x1) {
+				SDL_RenderFillRectF(video_state->renderer, &(SDL_FRect) {
+					(f32) (column * size),
+					(f32) (row * size),
+					size,
+					size
+				});
+			}
+			the_action >>= 1;
+		}
+	}
+}
+
+void IZ_VideoUpdateForDebugNet(IZ_VideoState* video_state, IZ_NetState* net_state) {
+	if (!net_state->ws.connection) {
+		return;
+	}
+	const u8 size = 4;
+
+	SDL_SetRenderDrawColor(video_state->renderer, 0x00, 0xff, 0x00, 0xff);
+	SDL_RenderFillRectF(video_state->renderer, &(SDL_FRect) {
+		0,
+		(f32) (video_state->config.height - size),
+		size,
+		size,
+	});
+
+	u8 column;
+	u8 row;
+
+	u8 player_index;
+	u8 control_index;
+	for (player_index = 0; player_index < IZ_PLAYERS; player_index += 1) {
+		IZ_Action the_action = net_state->action[player_index];
+		for (control_index = 0; control_index < CONTROLS; control_index += 1) {
+			column = (control_index % 4) + (player_index * 4);
+			row = control_index / 4;
+
+			if (the_action & 0x1) {
+				SDL_RenderFillRectF(video_state->renderer, &(SDL_FRect) {
+					(f32) (column * size),
+					(f32) ((row * size) + (video_state->config.height - (size * 5))),
+					size,
+					size
+				});
+			}
+			the_action >>= 1;
+		}
+	}
+}
+
+void IZ_VideoUpdate(IZ_VideoState* video_state) {
+	struct IZ_App* app = video_state->user_data;
+	u64 ticks = IZ_AppGetTicks(app);
+	IZ_InputState* input_state = IZ_AppGetInputState(app);
+	IZ_NetState* net_state = IZ_AppGetNetState(app);
+
+	if (ticks - video_state->last_update_at > 1000 / video_state->config.max_fps) {
+		// Update window
+		SDL_SetRenderDrawColor(video_state->renderer, 0x00, 0x00, 0x00, 0xff);
+		SDL_RenderClear(video_state->renderer);
+		u8 sprite_index;
+		for (sprite_index = 0; sprite_index < MAX_ACTIVE_SPRITES; sprite_index += 1) {
+			if (!video_state->active_sprites[sprite_index]) {
+				continue;
+			}
+			// TODO draw sprites
+		}
+		IZ_VideoUpdateForDebugTicks(video_state, ticks);
+		IZ_VideoUpdateForDebugInput(video_state, input_state);
+		IZ_VideoUpdateForDebugNet(video_state, net_state);
+		SDL_RenderPresent(video_state->renderer);
+		video_state->last_update_at = ticks;
+	}
+}
diff --git a/src/packages/game/output/video/IZ_app.h b/src/packages/game/output/video/IZ_app.h
new file mode 100644
index 0000000..bc1775f
--- /dev/null
+++ b/src/packages/game/output/video/IZ_app.h
@@ -0,0 +1,9 @@
+#ifndef IZ_VIDEO_APP_H
+#define IZ_VIDEO_APP_H
+
+#include "IZ_video.h"
+#include "../../IZ_subsystem.h"
+
+void IZ_VideoUpdate(IZ_VideoState*);
+
+#endif
diff --git a/src/packages/game/output/IZ_video.c b/src/packages/game/output/video/IZ_video.c
similarity index 100%
rename from src/packages/game/output/IZ_video.c
rename to src/packages/game/output/video/IZ_video.c
diff --git a/src/packages/game/output/IZ_video.h b/src/packages/game/output/video/IZ_video.h
similarity index 81%
rename from src/packages/game/output/IZ_video.h
rename to src/packages/game/output/video/IZ_video.h
index 05c031e..fdf4006 100644
--- a/src/packages/game/output/IZ_video.h
+++ b/src/packages/game/output/video/IZ_video.h
@@ -2,13 +2,13 @@
 #define IZ_VIDEO_H
 
 #include <stdio.h>
-#include <minIni.h>
-#include <SDL_render.h>
+#include "minIni.h"
+#include "SDL_render.h"
 
-#include "../input/IZ_input.h"
-#include "../net/IZ_net.h"
-#include "../IZ_common.h"
-#include "../IZ_config.h"
+#include "../../input/IZ_input.h"
+#include "../../net/IZ_net.h"
+#include "../../IZ_common.h"
+#include "../../IZ_config.h"
 
 #define MAX_ACTIVE_SPRITES 32
 
@@ -47,8 +47,6 @@ IZ_ProcedureResult IZ_VideoInitialize(IZ_VideoState*, void*, const char*, u8, co
 
 IZ_ProcedureResult IZ_VideoSaveConfig(IZ_VideoState*, const char*);
 
-void IZ_VideoUpdate(IZ_VideoState*);
-
 void IZ_VideoTeardown(IZ_VideoState*);
 
 #endif