diff --git a/projects/openrct2.vcxproj b/projects/openrct2.vcxproj
index 991a80aa18..95aba80932 100644
--- a/projects/openrct2.vcxproj
+++ b/projects/openrct2.vcxproj
@@ -125,6 +125,7 @@
       <SDLCheck>true</SDLCheck>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <StructMemberAlignment>1Byte</StructMemberAlignment>
+      <TreatSpecificWarningsAsErrors>4013</TreatSpecificWarningsAsErrors>
     </ClCompile>
     <Link>
       <GenerateDebugInformation>true</GenerateDebugInformation>
diff --git a/src/addresses.h b/src/addresses.h
index 1257d1daab..df031c8785 100644
--- a/src/addresses.h
+++ b/src/addresses.h
@@ -61,6 +61,10 @@
 
 #define RCT2_ADDRESS_RUN_INTRO_TICK_PART			0x009AC319
 
+#define RCT2_ADDRESS_INPUT_STATE					0x009DE51D
+#define RCT2_ADDRESS_CURSOR_DOWN_WINDOWCLASS		0x009DE51F
+#define RCT2_ADDRESS_CURSOR_DOWN_WINDOWNUMBER		0x009DE520
+
 #define RCT2_ADDRESS_TOOLTIP_WINDOW_CLASS			0x009DE533
 #define RCT2_ADDRESS_TOOLTIP_WINDOW_NUMBER			0x009DE534
 #define RCT2_ADDRESS_TOOLTIP_WIDGET_INDEX			0x009DE536
@@ -73,6 +77,8 @@
 #define RCT2_ADDRESS_PLACE_OBJECT_MODIFIER			0x009DEA70
 #define RCT2_ADDRESS_ON_TUTORIAL					0x009DEA71
 
+#define RCT2_ADDRESS_WINDOW_DPI						0x009DEA74
+
 #define RCT2_ADDRESS_CMDLINE						0x009E2D98
 
 #define RCT2_ADDRESS_G1_ELEMENTS					0x009EBD28
@@ -104,6 +110,8 @@
 #define RCT2_ADDRESS_OS_TIME_MONTH					0x01423A04
 #define RCT2_ADDRESS_OS_TOTALPHYS					0x01423B5C
 #define RCT2_ADDRESS_OS_TIME_DAY					0x01424304
+#define RCT2_ADDRESS_OS_TIME_YEAR					0x01424320
+#define RCT2_ADDRESS_OS_TIME_DAYOFWEEK				0x01423B20
 
 static void RCT2_CALLPROC_EBPSAFE(int address)
 {
diff --git a/src/game.c b/src/game.c
index cc32a7a89d..10344b06ed 100644
--- a/src/game.c
+++ b/src/game.c
@@ -79,7 +79,7 @@ void game_update()
 
 	RCT2_CALLPROC_EBPSAFE(0x006EE77A);
 
-	RCT2_CALLPROC_EBPSAFE(0x006E77A1); // window_refresh_all();
+	window_update_all();
 
 	RCT2_GLOBAL(0x01388698, uint16)++;
 
@@ -136,7 +136,7 @@ void game_logic_update()
 	RCT2_CALLPROC_EBPSAFE(0x0067009A);
 
 	// Update windows
-	window_update_all();
+	window_dispatch_update_all();
 
 	if (RCT2_GLOBAL(0x009AC31B, uint8) != 0) {
 		_bx = 3010;
diff --git a/src/gfx.c b/src/gfx.c
index 1f9fd72e13..5c3d330eeb 100644
--- a/src/gfx.c
+++ b/src/gfx.c
@@ -24,6 +24,9 @@
 #include "addresses.h"
 #include "gfx.h"
 #include "rct2.h"
+#include "window.h"
+
+uint8 _screenDirtyBlocks[5120];
 
 /**
  * 
@@ -171,5 +174,101 @@ void gfx_invalidate_screen()
  */
 void gfx_set_dirty_blocks(int left, int top, int right, int bottom)
 {
-	RCT2_CALLPROC_X(0x006E732D, left, top, 0, right, 0, 0, bottom);
+	int x, y;
+	uint8 *screenDirtyBlocks = RCT2_ADDRESS(0x00EDE408, uint8);
+
+	left = max(left, 0);
+	top = max(top, 0);
+	right = min(right, RCT2_GLOBAL(RCT2_ADDRESS_SCREEN_WIDTH, sint16));
+	bottom = min(bottom, RCT2_GLOBAL(RCT2_ADDRESS_SCREEN_HEIGHT, sint16));
+
+	if (left >= right)
+		return;
+	if (top >= bottom)
+		return;
+
+	right--;
+	bottom--;
+
+	left >>= RCT2_GLOBAL(0x009ABDF0, sint8);
+	right >>= RCT2_GLOBAL(0x009ABDF0, sint8);
+	top >>= RCT2_GLOBAL(0x009ABDF1, sint8);
+	bottom >>= RCT2_GLOBAL(0x009ABDF1, sint8);
+
+	for (y = top; y <= bottom; y++)
+		for (x = left; x <= right; x++)
+			screenDirtyBlocks[y * RCT2_GLOBAL(0x009ABDE8, sint32) + x] = 0xFF;
+}
+
+/**
+*
+*  rct2: 0x006E73BE
+*/
+void gfx_draw_dirty_blocks()
+{
+	int i, x, y, yy, yyy;
+	short left, top, right, bottom;
+	uint8 *screenDirtyBlocks = RCT2_ADDRESS(0x00EDE408, uint8);
+
+	x = y = i = 0;
+	for (x = 0; x < RCT2_GLOBAL(0x009ABDE8, sint32); x++) {
+		for (y = 0; y < RCT2_GLOBAL(0x009ABDEC, sint32); y++) {
+			if (screenDirtyBlocks[y * RCT2_GLOBAL(0x009ABDE8, sint32) + x] == 0)
+				continue;
+
+			for (yy = y; yy < RCT2_GLOBAL(0x009ABDEC, sint32); yy++)
+				if (screenDirtyBlocks[yy * RCT2_GLOBAL(0x009ABDE8, sint32) + x] == 0)
+					break;
+			yy--;
+
+			// Reset the dirty blocks
+			for (yyy = y; yyy <= yy; yyy += RCT2_GLOBAL(0x009ABDE8, sint32))
+				screenDirtyBlocks[yyy * RCT2_GLOBAL(0x009ABDE8, sint32) + x] = 0;
+
+			left = x * RCT2_GLOBAL(0x009ABDE4, sint16);
+			top = y * RCT2_GLOBAL(0x009ABDE6, sint16);
+			right = ((x + 1) * RCT2_GLOBAL(0x009ABDE4, sint16));
+			bottom = ((yy + 1) * RCT2_GLOBAL(0x009ABDE4, sint16));
+			if (left < RCT2_GLOBAL(RCT2_ADDRESS_SCREEN_WIDTH, sint16) && top < RCT2_GLOBAL(RCT2_ADDRESS_SCREEN_HEIGHT, sint16)) {
+				right = min(right, RCT2_GLOBAL(RCT2_ADDRESS_SCREEN_WIDTH, sint16));
+				bottom = min(bottom, RCT2_GLOBAL(RCT2_ADDRESS_SCREEN_HEIGHT, sint16));
+				gfx_redraw_screen_rect(left, top, right, bottom);
+			}
+		}
+	}
+}
+
+/**
+ * 
+ *  rct2: 0x006E7499 
+ * left (ax)
+ * top (bx)
+ * right (dx)
+ * bottom (bp)
+ */
+void gfx_redraw_screen_rect(short left, short top, short right, short bottom)
+{
+	rct_window* w;
+	rct_drawpixelinfo *screenDPI = RCT2_ADDRESS(RCT2_ADDRESS_SCREEN_DPI, rct_drawpixelinfo);
+	rct_drawpixelinfo *windowDPI = RCT2_ADDRESS(RCT2_ADDRESS_WINDOW_DPI, rct_drawpixelinfo);
+
+	// Unsure what this does
+	RCT2_CALLPROC_X(0x00683326, left, top, right - 1, bottom - 1, 0, 0, 0);
+
+	windowDPI->bits = screenDPI->bits + left + ((screenDPI->width + screenDPI->pitch) * top);
+	windowDPI->x = left;
+	windowDPI->y = top;
+	windowDPI->width = right - left;
+	windowDPI->height = bottom - top;
+	windowDPI->pitch = screenDPI->width + screenDPI->pitch + left - right;
+
+	for (w = RCT2_ADDRESS(RCT2_ADDRESS_WINDOW_LIST, rct_window); w < RCT2_GLOBAL(RCT2_ADDRESS_NEW_WINDOW_PTR, rct_window*); w++) {
+		if (w->flags & WF_TRANSPARENT)
+			continue;
+		if (right <= w->x || bottom <= w->y)
+			continue;
+		if (left >= w->x + w->width || top >= w->y + w->height)
+			continue;
+		window_draw(w, left, top, right, bottom);
+	}
 }
\ No newline at end of file
diff --git a/src/news_item.c b/src/news_item.c
index ee9efdf9d3..2d40180b94 100644
--- a/src/news_item.c
+++ b/src/news_item.c
@@ -19,10 +19,13 @@
  *****************************************************************************/
 
 #include "addresses.h"
+#include "audio.h"
 #include "news_item.h"
 #include "rct2.h"
 #include "window.h"
 
+static int news_item_get_new_history_slot();
+
 /**
  *
  *  rct2: 0x0066DF32
@@ -46,11 +49,10 @@ void news_item_init_queue()
  */
 void news_item_update_current()
 {
-	int _ebp;
 	short ax, bx, remove_time;
 	rct_news_item *newsItems = RCT2_ADDRESS(RCT2_ADDRESS_NEWS_ITEM_LIST, rct_news_item);
 
-	RCT2_CALLPROC_EBPSAFE(0x00407671); // get_system_time()
+	get_system_time();
 
 	ax = RCT2_GLOBAL(RCT2_ADDRESS_OS_TIME_DAY, sint16);
 	bx = RCT2_GLOBAL(RCT2_ADDRESS_OS_TIME_MONTH, sint16);
@@ -143,7 +145,7 @@ void news_item_close_current()
  * Finds a spare history slot or replaces an existing one if there are no spare
  * slots available.
  */
-int news_item_get_new_history_slot()
+static int news_item_get_new_history_slot()
 {
 	int i;
 	rct_news_item *newsItems = RCT2_ADDRESS(RCT2_ADDRESS_NEWS_ITEM_LIST, rct_news_item);
diff --git a/src/news_item.h b/src/news_item.h
index 87b6c682b5..6eaf56f923 100644
--- a/src/news_item.h
+++ b/src/news_item.h
@@ -54,6 +54,7 @@ typedef struct {
 } rct_news_item;
 
 void news_item_init_queue();
+void news_item_update_current();
 void news_item_close_current();
 
 #endif
\ No newline at end of file
diff --git a/src/rct2.c b/src/rct2.c
index 43e0e3d017..552ae9312e 100644
--- a/src/rct2.c
+++ b/src/rct2.c
@@ -29,10 +29,12 @@
 #include "game.h"
 #include "gfx.h"
 #include "intro.h"
+#include "news_item.h"
 #include "osinterface.h"
 #include "rct2.h"
 #include "scenario.h"
 #include "title.h"
+#include "viewport.h"
 
 void rct2_init_directories();
 void rct2_startup_checks();
@@ -90,7 +92,7 @@ void rct2_init()
 {
 	RCT2_GLOBAL(0x00F663AC, int) = 0;
 	RCT2_GLOBAL(0x009AC310, char*) = RCT2_GLOBAL(RCT2_ADDRESS_CMDLINE, char*);
-	RCT2_CALLPROC_EBPSAFE(0x00407671); // get_system_time()
+	get_system_time();
 	RCT2_GLOBAL(0x009DEA69, short) = RCT2_GLOBAL(0x01424304, short);
 	RCT2_GLOBAL(0x009DEA6B, short) = RCT2_GLOBAL(0x01424304, short);
 	rct2_init_directories();
@@ -106,7 +108,7 @@ void rct2_init()
 	RCT2_CALLPROC_EBPSAFE(0x006C19AC);
 	osinterface_init();
 	RCT2_CALLPROC_EBPSAFE(0x006BA8E0); // init_audio();
-	RCT2_CALLPROC_EBPSAFE(0x006E6EAC); // viewport_init_all();
+	viewport_init_all();
 	news_item_init_queue();
 	RCT2_CALLPROC_EBPSAFE(0x006C45E7); // get local time
 	RCT2_CALLPROC_EBPSAFE(0x00667104);
@@ -221,7 +223,22 @@ char *get_file_path(int pathId)
 
 	ebx = pathId;
 	RCT2_CALLFUNC_X(0x00674E6C, &eax, &ebx, &ecx, &edx, &esi, &edi, &ebp);
-	return ebx;
+	return (char*)ebx;
+}
+
+/**
+ * Obtains os system time (day, month, year and day of the week).
+ *  rct2: 0x00407671
+ */
+void get_system_time()
+{
+	SYSTEMTIME systime;
+
+	GetSystemTime(&systime);
+	RCT2_GLOBAL(RCT2_ADDRESS_OS_TIME_DAY, sint16) = systime.wDay;
+	RCT2_GLOBAL(RCT2_ADDRESS_OS_TIME_MONTH, sint16) = systime.wMonth;
+	RCT2_GLOBAL(RCT2_ADDRESS_OS_TIME_YEAR, sint16) = systime.wYear;
+	RCT2_GLOBAL(RCT2_ADDRESS_OS_TIME_DAYOFWEEK, sint16) = systime.wDayOfWeek;
 }
 
 /**
@@ -250,5 +267,5 @@ void *rct2_realloc(void *block, size_t numBytes)
  */
 void rct2_free(void *block)
 {
-	return RCT2_CALLPROC_1(0x004068DE, void*, block);
+	RCT2_CALLPROC_1(0x004068DE, void*, block);
 }
\ No newline at end of file
diff --git a/src/rct2.h b/src/rct2.h
index c9a137e9e2..0ffc2af9fc 100644
--- a/src/rct2.h
+++ b/src/rct2.h
@@ -115,6 +115,7 @@ enum {
 };
 
 char *get_file_path(int pathId);
+void get_system_time();
 void *rct2_malloc(size_t numBytes);
 void *rct2_realloc(void *block, size_t numBytes);
 void rct2_free(void *block);
diff --git a/src/scenario.c b/src/scenario.c
index a5e0add04b..8e90feb6d9 100644
--- a/src/scenario.c
+++ b/src/scenario.c
@@ -65,7 +65,6 @@ void scenario_load_list()
 	HANDLE hFindFile;
 	WIN32_FIND_DATAA findFileData;
 	int i;
-	char *src, *dst;
 
 	// Load scores
 	scenario_scores_load();
diff --git a/src/title.c b/src/title.c
index 282cccff60..364640e155 100644
--- a/src/title.c
+++ b/src/title.c
@@ -118,7 +118,7 @@ void title_update()
 
 	RCT2_CALLPROC_EBPSAFE(0x006EE77A);
 
-	RCT2_CALLPROC_EBPSAFE(0x006E77A1); // window_refresh_all();
+	window_update_all();
 
 	RCT2_GLOBAL(0x01388698, uint16)++;
 
diff --git a/src/viewport.c b/src/viewport.c
index 08edd0f6c5..d51feac9b4 100644
--- a/src/viewport.c
+++ b/src/viewport.c
@@ -19,9 +19,77 @@
  *****************************************************************************/
 
 #include "addresses.h"
+#include "gfx.h"
+#include "strings.h"
 #include "viewport.h"
+#include "window.h"
 
+#define RCT2_FIRST_VIEWPORT		(RCT2_ADDRESS(RCT2_ADDRESS_VIEWPORT_LIST, rct_viewport))
+#define RCT2_LAST_VIEWPORT		(RCT2_GLOBAL(RCT2_ADDRESS_NEW_VIEWPORT_PTR, rct_viewport*) - 1)
+#define RCT2_NEW_VIEWPORT		(RCT2_GLOBAL(RCT2_ADDRESS_NEW_VIEWPORT_PTR, rct_viewport*))
+
+/**
+ * 
+ *  rct2: 0x006E6EAC
+ */
 void viewport_init_all()
 {
-	RCT2_CALLPROC_EBPSAFE(0x006E6EAC);
+	int i, d;
+	rct_g1_element *g1_element;
+
+	// Palette from sprites?
+	d = 0;
+	for (i = 4915; i < 4947; i++) {
+		g1_element = &(RCT2_ADDRESS(RCT2_ADDRESS_G1_ELEMENTS, rct_g1_element)[i]);
+		*((int*)(0x0141FC44 + d)) = *((int*)(&g1_element->offset[0xF5]));
+		*((int*)(0x0141FC48 + d)) = *((int*)(&g1_element->offset[0xF9]));
+		*((int*)(0x0141FD44 + d)) = *((int*)(&g1_element->offset[0xFD]));
+		d += 8;
+	}
+
+	// Setting up windows
+	RCT2_GLOBAL(RCT2_ADDRESS_NEW_WINDOW_PTR, rct_window*) = RCT2_ADDRESS(RCT2_ADDRESS_WINDOW_LIST, rct_window);
+	RCT2_GLOBAL(0x01423604, sint32) = 0;
+
+	// Setting up viewports
+	for (i = 0; i < 9; i++)
+		RCT2_FIRST_VIEWPORT[i].width = 0;
+	RCT2_NEW_VIEWPORT = NULL;
+
+	// ?
+	RCT2_GLOBAL(0x009DE518, sint32) = 0;
+	RCT2_GLOBAL(RCT2_ADDRESS_INPUT_STATE, sint8) = INPUT_STATE_RESET;
+	RCT2_GLOBAL(RCT2_ADDRESS_CURSOR_DOWN_WINDOWCLASS, rct_windowclass) = -1;
+	RCT2_GLOBAL(0x009DE550, sint32) = -1;
+	RCT2_GLOBAL(RCT2_ADDRESS_TOOLTIP_NOT_SHOWN_TICKS, sint16) = -1;
+	RCT2_GLOBAL(0x009DE58A, sint16) = 0;
+	RCT2_GLOBAL(0x009DEA50, sint16) = -1;
+	RCT2_CALLPROC_EBPSAFE(0x006EE3C3);
+	format_string((char*)0x0141FA44, STR_CANCEL, NULL);
+	format_string((char*)0x0141F944, STR_OK, NULL);
+}
+
+/**
+ * UNTESTED
+ *  rct2: 0x006EE510
+ */
+void viewport_update_pointers()
+{
+	rct_viewport *viewport;
+	rct_viewport **vp = &RCT2_NEW_VIEWPORT;
+
+	for (viewport = RCT2_FIRST_VIEWPORT; viewport <= RCT2_NEW_VIEWPORT; viewport++)
+		if (viewport->width != 0)
+			*vp++ = viewport;
+
+	*vp = NULL;
+}
+
+/**
+ * 
+ *  rct2: 0x006E7A3A
+ */
+void viewport_update_position(rct_window *window)
+{
+	RCT2_CALLPROC_X(0x006E7A3A, 0, 0, 0, 0, window, 0, 0);
 }
\ No newline at end of file
diff --git a/src/viewport.h b/src/viewport.h
index 762e14bc4c..672cc3345f 100644
--- a/src/viewport.h
+++ b/src/viewport.h
@@ -21,6 +21,10 @@
 #ifndef _VIEWPORT_H_
 #define _VIEWPORT_H_
 
+#include "window.h"
+
 void viewport_init_all();
+void viewport_update_pointers();
+void viewport_update_position(rct_window *window);
 
 #endif
\ No newline at end of file
diff --git a/src/window.c b/src/window.c
index d9dab19d82..e773f963a2 100644
--- a/src/window.c
+++ b/src/window.c
@@ -24,13 +24,17 @@
 #include "rct2.h"
 #include "widget.h"
 #include "window.h"
+#include "viewport.h"
 
 #define RCT2_FIRST_WINDOW		(RCT2_ADDRESS(RCT2_ADDRESS_WINDOW_LIST, rct_window))
 #define RCT2_LAST_WINDOW		(RCT2_GLOBAL(RCT2_ADDRESS_NEW_WINDOW_PTR, rct_window*) - 1)
 #define RCT2_NEW_WINDOW			(RCT2_GLOBAL(RCT2_ADDRESS_NEW_WINDOW_PTR, rct_window*))
 
-// rct2: 0x006ED7B0
-void window_update_all()
+/**
+ * 
+ *  rct2: 0x006ED7B0
+ */
+void window_dispatch_update_all()
 {
 	rct_window *w;
 
@@ -43,6 +47,47 @@ void window_update_all()
 	RCT2_CALLPROC_EBPSAFE(0x006EE411);
 }
 
+/**
+ * 
+ *  rct2: 0x006E77A1
+ */
+void window_update_all()
+{
+	rct_window* w;
+
+	RCT2_GLOBAL(0x009E3CD8, sint32)++;
+	// if (RCT2_GLOBAL(0x009E3CD8, sint32) == 224 && RCT2_GLOBAL(0x009ABDF2, sint8) != 0)
+	//	RCT2_CALLPROC(0x004067E3); // ddwindow_move_to_top_corner
+
+	if (RCT2_GLOBAL(0x009ABDF2, sint8) == 0)
+		return;
+
+	gfx_draw_dirty_blocks();
+
+	for (w = RCT2_FIRST_WINDOW; w < RCT2_NEW_WINDOW; w++)
+		if (w->viewport != NULL)
+			viewport_update_position(w);
+
+	// 1000 tick update
+	RCT2_GLOBAL(0x009DEB7C, sint16) += RCT2_GLOBAL(0x009DE588, sint16);
+	if (RCT2_GLOBAL(0x009DEB7C, sint16) >= 1000) {
+		RCT2_GLOBAL(0x009DEB7C, sint16) = 0;
+		for (w = RCT2_LAST_WINDOW; w >= RCT2_FIRST_WINDOW; w--)
+			RCT2_CALLPROC_X(w->event_handlers[WE_UNKNOWN_07], 0, 0, 0, 0, w, 0, 0);
+	}
+
+	// Border flash invalidation
+	for (w = RCT2_LAST_WINDOW; w >= RCT2_FIRST_WINDOW; w--) {
+		if (w->flags & WF_WHITE_BORDER_MASK) {
+			w->flags -= WF_WHITE_BORDER_ONE;
+			if (!(w->flags & WF_WHITE_BORDER_MASK))
+				window_invalidate(w);
+		}
+	}
+
+	RCT2_CALLPROC_X(0x006E7868, 0, 0, 0, 0, 0, RCT2_ADDRESS(RCT2_ADDRESS_SCREEN_DPI, rct_drawpixelinfo), 0); // process_mouse_wheel_input();
+}
+
 /**
  * Opens a new window.
  *  rct2: 0x006EACA4
@@ -140,7 +185,7 @@ void window_close(rct_window* window)
 		return;
 
 	// Call close event of window
-	// window_call_basic_event(window, WE_CLOSE);
+	RCT2_CALLPROC_X(window->event_handlers[WE_CLOSE], 0, 0, 0, 0, window, 0, 0);
 
 	window = window_find_by_id(window->classification, window->number);
 
@@ -159,8 +204,7 @@ void window_close(rct_window* window)
 	if (num_windows > 0)
 		memmove(window, window + 1, num_windows * sizeof(rct_window));
 
-	// ?
-	RCT2_CALLPROC(0x006EE510);
+	viewport_update_pointers();
 }
 
 /**
@@ -347,4 +391,17 @@ rct_window *window_bring_to_front(rct_window *w)
 	}
 
 	return w;
+}
+
+/**
+ * Draws a window that is in the specified region.
+ *  rct2: 0x006E756C
+ * left (ax)
+ * top (bx)
+ * right (dx)
+ * bottom (bp)
+ */
+void window_draw(rct_window *w, int left, int top, int right, int bottom)
+{
+	RCT2_CALLPROC_X(0x006E756C, left, top, 0, right, w, 0, bottom);
 }
\ No newline at end of file
diff --git a/src/window.h b/src/window.h
index 98bc19659a..52ea516238 100644
--- a/src/window.h
+++ b/src/window.h
@@ -266,6 +266,7 @@ enum {
 	WC_CHEATS = 110,
 } WINDOW_CLASS;
 
+void window_dispatch_update_all();
 void window_update_all();
 rct_window *window_create(int x, int y, int width, int height, uint32 *event_handlers, rct_windowclass cls, uint16 flags);
 void window_close(rct_window *window);
@@ -278,4 +279,6 @@ int window_get_scroll_data_index(rct_window *w, int widget_index);
 rct_window *window_bring_to_front_by_id(rct_windowclass cls, rct_windownumber number);
 rct_window *window_bring_to_front(rct_window *w);
 
+void window_draw(rct_window *w, int left, int top, int right, int bottom);
+
 #endif
\ No newline at end of file