diff --git a/demo/demo_hook.c b/demo/demo_hook.c
index 128ebf68..5b8b7fd8 100644
--- a/demo/demo_hook.c
+++ b/demo/demo_hook.c
@@ -59,8 +59,8 @@ static void logger(unsigned int level, const char *format, ...) {
 void dispatch_proc(uiohook_event * const event, void *user_data) {
     char buffer[256] = { 0 };
     size_t length = snprintf(buffer, sizeof(buffer), 
-            "id=%i,when=%" PRIu64 ",mask=0x%X", 
-            event->type, event->time, event->mask);
+            "id=%i,when=%" PRIu64 ",mask=0x%X, reserved=0x%X",
+            event->type, event->time, event->mask, event->reserved);
 
     switch (event->type) {
         case EVENT_KEY_PRESSED:
diff --git a/src/darwin/dispatch_event.c b/src/darwin/dispatch_event.c
index cc492907..a6a09714 100644
--- a/src/darwin/dispatch_event.c
+++ b/src/darwin/dispatch_event.c
@@ -116,7 +116,7 @@ bool dispatch_key_press(uint64_t timestamp, CGEventRef event_ref) {
 
     // Populate key pressed event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = CGEventGetIntegerValueField(event_ref, kCGEventSourceUnixProcessID) ? 0x02 : 0x00;
 
     uio_event.type = EVENT_KEY_PRESSED;
     uio_event.mask = get_modifiers();
@@ -141,7 +141,7 @@ bool dispatch_key_press(uint64_t timestamp, CGEventRef event_ref) {
         for (unsigned int i = 0; i < length; i++) {
             // Populate key typed event.
             uio_event.time = timestamp;
-            uio_event.reserved = 0x00;
+            uio_event.reserved = CGEventGetIntegerValueField(event_ref, kCGEventSourceUnixProcessID) ? 0x02 : 0x00;
 
             uio_event.type = EVENT_KEY_TYPED;
             uio_event.mask = get_modifiers();
@@ -171,7 +171,7 @@ bool dispatch_key_release(uint64_t timestamp, CGEventRef event_ref) {
 
     // Populate key released event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = CGEventGetIntegerValueField(event_ref, kCGEventSourceUnixProcessID) ? 0x02 : 0x00;
 
     uio_event.type = EVENT_KEY_RELEASED;
     uio_event.mask = get_modifiers();
@@ -469,7 +469,7 @@ bool dispatch_button_press(uint64_t timestamp, CGEventRef event_ref, uint16_t bu
 
     // Populate mouse pressed event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = CGEventGetIntegerValueField(event_ref, kCGEventSourceUnixProcessID) ? 0x02 : 0x00;
 
     uio_event.type = EVENT_MOUSE_PRESSED;
     uio_event.mask = get_modifiers();
@@ -498,7 +498,7 @@ bool dispatch_button_release(uint64_t timestamp, CGEventRef event_ref, uint16_t
 
     // Populate mouse released event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = CGEventGetIntegerValueField(event_ref, kCGEventSourceUnixProcessID) ? 0x02 : 0x00;
 
     uio_event.type = EVENT_MOUSE_RELEASED;
     uio_event.mask = get_modifiers();
@@ -521,7 +521,7 @@ bool dispatch_button_release(uint64_t timestamp, CGEventRef event_ref, uint16_t
     if (uio_event.reserved ^ 0x01 && !is_mouse_dragged()) {
         // Populate mouse clicked event.
         uio_event.time = timestamp;
-        uio_event.reserved = 0x00;
+        uio_event.reserved = CGEventGetIntegerValueField(event_ref, kCGEventSourceUnixProcessID) ? 0x02 : 0x00;
 
         uio_event.type = EVENT_MOUSE_CLICKED;
         uio_event.mask = get_modifiers();
@@ -562,7 +562,7 @@ bool dispatch_mouse_move(uint64_t timestamp, CGEventRef event_ref) {
 
     // Populate mouse motion event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = CGEventGetIntegerValueField(event_ref, kCGEventSourceUnixProcessID) ? 0x02 : 0x00;
 
     if (is_mouse_dragged()) {
         uio_event.type = EVENT_MOUSE_DRAGGED;
@@ -603,7 +603,7 @@ bool dispatch_mouse_wheel(uint64_t timestamp, CGEventRef event_ref) {
 
         // Populate mouse wheel event.
         uio_event.time = timestamp;
-        uio_event.reserved = 0x00;
+        uio_event.reserved = CGEventGetIntegerValueField(event_ref, kCGEventSourceUnixProcessID) ? 0x02 : 0x00;
 
         uio_event.type = EVENT_MOUSE_WHEEL;
         uio_event.mask = get_modifiers();
diff --git a/src/windows/dispatch_event.c b/src/windows/dispatch_event.c
index 8240a98a..46f59cce 100644
--- a/src/windows/dispatch_event.c
+++ b/src/windows/dispatch_event.c
@@ -150,7 +150,7 @@ bool dispatch_key_press(KBDLLHOOKSTRUCT *kbhook) {
 
     // Populate key pressed event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = kbhook->flags & (LLKHF_INJECTED | LLKHF_LOWER_IL_INJECTED) ? 0x02 : 0x00;
 
     uio_event.type = EVENT_KEY_PRESSED;
     uio_event.mask = get_modifiers();
@@ -177,7 +177,7 @@ bool dispatch_key_press(KBDLLHOOKSTRUCT *kbhook) {
         for (unsigned int i = 0; i < count; i++) {
             // Populate key typed event.
             uio_event.time = timestamp;
-            uio_event.reserved = 0x00;
+            uio_event.reserved = kbhook->flags & (LLKHF_INJECTED | LLKHF_LOWER_IL_INJECTED) ? 0x02 : 0x00;
 
             uio_event.type = EVENT_KEY_TYPED;
             uio_event.mask = get_modifiers();
@@ -222,7 +222,7 @@ bool dispatch_key_release(KBDLLHOOKSTRUCT *kbhook) {
 
     // Populate key pressed event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = kbhook->flags & (LLKHF_INJECTED | LLKHF_LOWER_IL_INJECTED) ? 0x02 : 0x00;
 
     uio_event.type = EVENT_KEY_RELEASED;
     uio_event.mask = get_modifiers();
@@ -275,7 +275,7 @@ bool dispatch_button_press(MSLLHOOKSTRUCT *mshook, uint16_t button) {
 
     // Populate mouse pressed event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = mshook->flags & (LLMHF_INJECTED | LLMHF_LOWER_IL_INJECTED) ? 0x02 : 0x00;
 
     uio_event.type = EVENT_MOUSE_PRESSED;
     uio_event.mask = get_modifiers();
@@ -308,7 +308,7 @@ bool dispatch_button_release(MSLLHOOKSTRUCT *mshook, uint16_t button) {
 
     // Populate mouse released event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = mshook->flags & (LLMHF_INJECTED | LLMHF_LOWER_IL_INJECTED) ? 0x02 : 0x00;
 
     uio_event.type = EVENT_MOUSE_RELEASED;
     uio_event.mask = get_modifiers();
@@ -332,7 +332,7 @@ bool dispatch_button_release(MSLLHOOKSTRUCT *mshook, uint16_t button) {
     if (!consumed && last_click.x == mshook->pt.x && last_click.y == mshook->pt.y) {
         // Populate mouse clicked event.
         uio_event.time = timestamp;
-        uio_event.reserved = 0x00;
+        uio_event.reserved = mshook->flags & (LLMHF_INJECTED | LLMHF_LOWER_IL_INJECTED) ? 0x02 : 0x00;
 
         uio_event.type = EVENT_MOUSE_CLICKED;
         uio_event.mask = get_modifiers();
@@ -380,7 +380,7 @@ bool dispatch_mouse_move(MSLLHOOKSTRUCT *mshook) {
 
         // Populate mouse move event.
         uio_event.time = timestamp;
-        uio_event.reserved = 0x00;
+        uio_event.reserved = mshook->flags & (LLMHF_INJECTED | LLMHF_LOWER_IL_INJECTED) ? 0x02 : 0x00;
 
         uio_event.mask = get_modifiers();
 
@@ -427,7 +427,7 @@ bool dispatch_mouse_wheel(MSLLHOOKSTRUCT *mshook, uint8_t direction) {
 
     // Populate mouse wheel event.
     uio_event.time = timestamp;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = mshook->flags & (LLMHF_INJECTED | LLMHF_LOWER_IL_INJECTED) ? 0x02 : 0x00;
 
     uio_event.type = EVENT_MOUSE_WHEEL;
     uio_event.mask = get_modifiers();
diff --git a/src/x11/dispatch_event.c b/src/x11/dispatch_event.c
index f1550893..275e0ef6 100644
--- a/src/x11/dispatch_event.c
+++ b/src/x11/dispatch_event.c
@@ -124,7 +124,7 @@ void dispatch_key_press(XKeyPressedEvent * const x_event) {
 
     // Populate key pressed event.
     uio_event.time = x_event->serial;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = x_event->send_event ? 0x02 : 0x00;
 
     uio_event.type = EVENT_KEY_PRESSED;
     uio_event.mask = get_modifiers();
@@ -145,7 +145,7 @@ void dispatch_key_press(XKeyPressedEvent * const x_event) {
         for (unsigned int i = 0; i < count; i++) {
             // Populate key typed event.
             uio_event.time = x_event->serial;
-            uio_event.reserved = 0x00;
+            uio_event.reserved = x_event->send_event ? 0x02 : 0x00;
 
             uio_event.type = EVENT_KEY_TYPED;
             uio_event.mask = get_modifiers();
@@ -189,7 +189,7 @@ void dispatch_key_release(XKeyReleasedEvent * const x_event) {
 
     // Populate key released event.
     uio_event.time = x_event->serial;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = x_event->send_event ? 0x02 : 0x00;
 
     uio_event.type = EVENT_KEY_RELEASED;
     uio_event.mask = get_modifiers();
@@ -213,7 +213,7 @@ static void dispatch_mouse_wheel_rotated(XButtonEvent * const x_event) {
 
     // Populate mouse wheel event.
     uio_event.time = x_event->serial;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = x_event->send_event ? 0x02 : 0x00;
 
     uio_event.type = EVENT_MOUSE_WHEEL;
     uio_event.mask = get_modifiers();
@@ -327,7 +327,7 @@ static void dispatch_mouse_button_pressed(XButtonPressedEvent * const x_event) {
 
     // Populate mouse pressed event.
     uio_event.time = x_event->serial;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = x_event->send_event ? 0x02 : 0x00;
 
     uio_event.type = EVENT_MOUSE_PRESSED;
     uio_event.mask = get_modifiers();
@@ -416,7 +416,7 @@ static void dispatch_mouse_button_released(XButtonReleasedEvent * const x_event)
 
     // Populate mouse released event.
     uio_event.time = x_event->serial;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = x_event->send_event ? 0x02 : 0x00;
 
     uio_event.type = EVENT_MOUSE_RELEASED;
     uio_event.mask = get_modifiers();
@@ -451,7 +451,7 @@ static void dispatch_mouse_button_released(XButtonReleasedEvent * const x_event)
 static void dispatch_mouse_button_clicked(XButtonEvent * const x_event) {
     // Populate mouse clicked event.
     uio_event.time = x_event->serial;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = x_event->send_event ? 0x02 : 0x00;
 
     uio_event.type = EVENT_MOUSE_CLICKED;
     uio_event.mask = get_modifiers();
@@ -518,7 +518,7 @@ void dispatch_mouse_move(XMotionEvent * const x_event) {
 
     // Populate mouse move event.
     uio_event.time = x_event->serial;
-    uio_event.reserved = 0x00;
+    uio_event.reserved = x_event->send_event ? 0x02 : 0x00;
 
     uio_event.mask = get_modifiers();