diff --git a/Kore/Backends/System/Android/Sources/kinc/backend/window.c.h b/Kore/Backends/System/Android/Sources/kinc/backend/window.c.h
index 2eeb18f..e1faa7d 100644
--- a/Kore/Backends/System/Android/Sources/kinc/backend/window.c.h
+++ b/Kore/Backends/System/Android/Sources/kinc/backend/window.c.h
@@ -49,6 +49,8 @@ void kinc_window_show(int window_index) {}
 
 void kinc_window_hide(int window_index) {}
 
+void kinc_window_set_foreground(int window_index) {}
+
 void kinc_window_set_title(int window_index, const char *title) {}
 
 int kinc_window_create(kinc_window_options_t *win, kinc_framebuffer_options_t *frame) {
diff --git a/Kore/Backends/System/Emscripten/Sources/kinc/backend/window.c.h b/Kore/Backends/System/Emscripten/Sources/kinc/backend/window.c.h
index 3f1220c..9982f3e 100644
--- a/Kore/Backends/System/Emscripten/Sources/kinc/backend/window.c.h
+++ b/Kore/Backends/System/Emscripten/Sources/kinc/backend/window.c.h
@@ -63,6 +63,8 @@ void kinc_window_show(int window_index) {}
 
 void kinc_window_hide(int window_index) {}
 
+void kinc_window_set_foreground(int window_index) {}
+
 // TODO: change browser title.
 void kinc_window_set_title(int window_index, const char *title) {}
 
diff --git a/Kore/Backends/System/Linux/Sources/kinc/backend/funcs.h b/Kore/Backends/System/Linux/Sources/kinc/backend/funcs.h
index cf66fb8..2982339 100644
--- a/Kore/Backends/System/Linux/Sources/kinc/backend/funcs.h
+++ b/Kore/Backends/System/Linux/Sources/kinc/backend/funcs.h
@@ -29,6 +29,7 @@ struct linux_procs {
 	int (*window_display)(int window_index);
 	void (*window_show)(int window_index);
 	void (*window_hide)(int window_index);
+	void (*window_set_foreground)(int window_index);
 	void (*window_set_title)(int window_index, const char *title);
 	void (*window_change_mode)(int window_index, kinc_window_mode_t mode);
 	kinc_window_mode_t (*window_get_mode)(int window_index);
diff --git a/Kore/Backends/System/Linux/Sources/kinc/backend/linuxunit.c b/Kore/Backends/System/Linux/Sources/kinc/backend/linuxunit.c
index e86e33d..111fba3 100644
--- a/Kore/Backends/System/Linux/Sources/kinc/backend/linuxunit.c
+++ b/Kore/Backends/System/Linux/Sources/kinc/backend/linuxunit.c
@@ -59,6 +59,7 @@ void kinc_linux_init_procs() {
 		procs.window_resize = kinc_wayland_window_resize;
 		procs.window_show = kinc_wayland_window_show;
 		procs.window_hide = kinc_wayland_window_hide;
+		procs.window_set_foreground = kinc_wayland_window_set_foreground;
 		procs.count_windows = kinc_wayland_count_windows;
 
 		procs.mouse_can_lock = kinc_wl_mouse_can_lock;
@@ -111,6 +112,7 @@ void kinc_linux_init_procs() {
 		procs.window_resize = kinc_x11_window_resize;
 		procs.window_show = kinc_x11_window_show;
 		procs.window_hide = kinc_x11_window_hide;
+		procs.window_set_foreground = kinc_x11_window_set_foreground;
 		procs.count_windows = kinc_x11_count_windows;
 
 		procs.display_init = kinc_x11_display_init;
diff --git a/Kore/Backends/System/Linux/Sources/kinc/backend/wayland/window.c.h b/Kore/Backends/System/Linux/Sources/kinc/backend/wayland/window.c.h
index bc49016..2c5d6c4 100644
--- a/Kore/Backends/System/Linux/Sources/kinc/backend/wayland/window.c.h
+++ b/Kore/Backends/System/Linux/Sources/kinc/backend/wayland/window.c.h
@@ -499,6 +499,10 @@ void kinc_wayland_window_hide(int window_index) {
 	kinc_log(KINC_LOG_LEVEL_ERROR, "Wayland does not support hiding windows.");
 }
 
+void kinc_wayland_window_set_foreground(int window_index) {
+	kinc_log(KINC_LOG_LEVEL_ERROR, "Wayland does not support activating windows.");
+}
+
 kinc_window_mode_t kinc_wayland_window_get_mode(int window_index) {
 	return wl_ctx.windows[window_index].mode;
 }
diff --git a/Kore/Backends/System/Linux/Sources/kinc/backend/window.c.h b/Kore/Backends/System/Linux/Sources/kinc/backend/window.c.h
index 47df1af..262cd26 100644
--- a/Kore/Backends/System/Linux/Sources/kinc/backend/window.c.h
+++ b/Kore/Backends/System/Linux/Sources/kinc/backend/window.c.h
@@ -80,6 +80,10 @@ void kinc_window_hide(int window_index) {
 	procs.window_hide(window_index);
 }
 
+void kinc_window_set_foreground(int window_index) {
+	procs.window_set_foreground(window_index);
+}
+
 void kinc_window_set_title(int window_index, const char *title) {
 	procs.window_set_title(window_index, title);
 }
diff --git a/Kore/Backends/System/Linux/Sources/kinc/backend/x11/window.c.h b/Kore/Backends/System/Linux/Sources/kinc/backend/x11/window.c.h
index fb8ada0..748b0cc 100644
--- a/Kore/Backends/System/Linux/Sources/kinc/backend/x11/window.c.h
+++ b/Kore/Backends/System/Linux/Sources/kinc/backend/x11/window.c.h
@@ -13,6 +13,7 @@ struct MwmHints {
 #define MWM_HINTS_DECORATIONS (1L << 1)
 
 void kinc_x11_window_set_title(int window_index, const char *title);
+void kinc_x11_window_set_foreground(int window_index);
 void kinc_x11_window_change_mode(int window_index, kinc_window_mode_t mode);
 
 int kinc_x11_window_create(kinc_window_options_t *win, kinc_framebuffer_options_t *frame) {
@@ -145,6 +146,16 @@ void kinc_x11_window_hide(int window_index) {
 	xlib.XUnmapWindow(x11_ctx.display, window->window);
 }
 
+void kinc_x11_window_set_foreground(int window_index) {
+	struct kinc_x11_window *window = &x11_ctx.windows[window_index];
+	if (window->window == None) {
+		return;
+	}
+	xlib.XRaiseWindow(x11_ctx.display, window->window);
+	xlib.XSetInputFocus(x11_ctx.display, window->window, RevertToParent, CurrentTime);
+	xlib.XFlush(x11_ctx.display);
+}
+
 kinc_window_mode_t kinc_x11_window_get_mode(int window_index) {
 	return x11_ctx.windows[window_index].mode;
 }
diff --git a/Kore/Backends/System/Wasm/Sources/kinc/backend/window.c.h b/Kore/Backends/System/Wasm/Sources/kinc/backend/window.c.h
index 3f1220c..9982f3e 100644
--- a/Kore/Backends/System/Wasm/Sources/kinc/backend/window.c.h
+++ b/Kore/Backends/System/Wasm/Sources/kinc/backend/window.c.h
@@ -63,6 +63,8 @@ void kinc_window_show(int window_index) {}
 
 void kinc_window_hide(int window_index) {}
 
+void kinc_window_set_foreground(int window_index) {}
+
 // TODO: change browser title.
 void kinc_window_set_title(int window_index, const char *title) {}
 
diff --git a/Kore/Backends/System/Windows/Sources/kinc/backend/window.c.h b/Kore/Backends/System/Windows/Sources/kinc/backend/window.c.h
index b22d623..a3d1357 100644
--- a/Kore/Backends/System/Windows/Sources/kinc/backend/window.c.h
+++ b/Kore/Backends/System/Windows/Sources/kinc/backend/window.c.h
@@ -392,6 +392,11 @@ void kinc_window_hide(int window_index) {
 	UpdateWindow(windows[window_index].handle);
 }
 
+void kinc_window_set_foreground(int window_index) {
+	SetForegroundWindow(windows[window_index].handle);
+	SetFocus(windows[window_index].handle);
+}
+
 void kinc_window_set_title(int window_index, const char *title) {
 	wchar_t buffer[1024];
 	MultiByteToWideChar(CP_UTF8, 0, title, -1, buffer, 1024);
diff --git a/Kore/Backends/System/iOS/Sources/kinc/backend/window.c.h b/Kore/Backends/System/iOS/Sources/kinc/backend/window.c.h
index f564d95..25c0c0d 100644
--- a/Kore/Backends/System/iOS/Sources/kinc/backend/window.c.h
+++ b/Kore/Backends/System/iOS/Sources/kinc/backend/window.c.h
@@ -41,6 +41,8 @@ void kinc_window_show(int window) {}
 
 void kinc_window_hide(int window) {}
 
+void kinc_window_set_foreground(int window) {}
+
 void kinc_window_set_title(int window, const char *title) {}
 
 int kinc_window_create(kinc_window_options_t *win, kinc_framebuffer_options_t *frame) {
diff --git a/Kore/Backends/System/macOS/Sources/kinc/backend/window.c.h b/Kore/Backends/System/macOS/Sources/kinc/backend/window.c.h
index e4b0de2..71127a4 100644
--- a/Kore/Backends/System/macOS/Sources/kinc/backend/window.c.h
+++ b/Kore/Backends/System/macOS/Sources/kinc/backend/window.c.h
@@ -46,6 +46,8 @@ void kinc_window_show(int window) {}
 
 void kinc_window_hide(int window) {}
 
+void kinc_window_set_foreground(int window) {}
+
 void kinc_window_set_title(int window, const char *title) {}
 
 int kinc_window_create(kinc_window_options_t *win, kinc_framebuffer_options_t *frame) {
diff --git a/Kore/Sources/kinc/window.h b/Kore/Sources/kinc/window.h
index 966053b..8905b2b 100644
--- a/Kore/Sources/kinc/window.h
+++ b/Kore/Sources/kinc/window.h
@@ -139,6 +139,11 @@ KINC_FUNC void kinc_window_show(int window);
 /// </summary>
 KINC_FUNC void kinc_window_hide(int window);
 
+/// <summary>
+/// Brings a window to the foreground and sets focus to it.
+/// </summary>
+KINC_FUNC void kinc_window_set_foreground(int window);
+
 /// <summary>
 /// Sets the title of a window.
 /// </summary>
diff --git a/Sources/main.cpp b/Sources/main.cpp
index 809df8e..5ca5a9e 100644
--- a/Sources/main.cpp
+++ b/Sources/main.cpp
@@ -2708,7 +2708,7 @@ namespace {
 	void runt_window_set_foreground(const FunctionCallbackInfo<Value> &args) {
 		HandleScope scope(args.GetIsolate());
 		int windowId = args[0]->ToInt32(isolate->GetCurrentContext()).ToLocalChecked()->Value();
-		// kinc_window_set_foreground(windowId); // TODO: add to Kore
+		kinc_window_set_foreground(windowId);
 	}
 
 	#define SET_FUNCTION_FAST(object, name, fn)\
@@ -4038,7 +4038,7 @@ int kickstart(int argc, char **argv) {
 	
 	start_runt(snapshot_found ? NULL : code);
 
-    #ifdef WITH_NETWORKING
+    #ifdef WITH_VIEWPORT
 	if (viewport_server_mode) {
 		kinc_log(KINC_LOG_LEVEL_INFO, "Initializing viewport server: %dx%d, shmem=%s", 
 		         viewport_width, viewport_height, viewport_shmem_name);