diff --git a/README.md b/README.md
index 03f44c4d..9223dc8c 100644
--- a/README.md
+++ b/README.md
@@ -68,10 +68,9 @@ xcode-select --install
 Download the Mingw, then set system environment variables `C:\mingw64\bin` to the Path.
 [Set environment variables to run GCC from command line](https://www.youtube.com/results?search_query=Set+environment+variables+to+run+GCC+from+command+line).
 
-
-```
+`
 Or the other GCC (But you should compile the "libpng" with yourself when use the bitmap.)
-```
+`
 
 #### For everything else:
 
diff --git a/doc.go b/doc.go
index d668b874..b28cde23 100644
--- a/doc.go
+++ b/doc.go
@@ -54,7 +54,7 @@ Keys are supported:
 	"f23"
 	"f24"
 
-	"cmd"		is the "win" key for windows
+	"cmd"		this is the "win" key for windows
 	"lcmd"		left command
 	"rcmd"		right command
 	// "command"
diff --git a/key.go b/key.go
index e59e1cf4..f0b37a80 100644
--- a/key.go
+++ b/key.go
@@ -30,6 +30,7 @@ import (
 	"github.com/vcaesar/tt"
 )
 
+// Defining a bunch of constants.
 const (
 	// KeyA define key "a"
 	KeyA = "a"
@@ -321,6 +322,7 @@ var keyNames = map[string]C.MMKeyCode{
 	// { NULL:              C.K_NOT_A_KEY }
 }
 
+// It sends a key press and release to the active application
 func tapKeyCode(code C.MMKeyCode, flags C.MMKeyFlags, pid C.uintptr) {
 	C.toggleKeyCode(code, true, flags, pid)
 	MilliSleep(3)
@@ -459,6 +461,7 @@ func ToStrings(fields []interface{}) []string {
 	return res
 }
 
+// toErr it converts a C string to a Go error
 func toErr(str *C.char) error {
 	gstr := C.GoString(str)
 	if gstr == "" {
@@ -481,6 +484,8 @@ func toErr(str *C.char) error {
 //
 //	arr := []string{"alt", "command"}
 //	robotgo.KeyTap("i", arr)
+//
+//	robotgo.KeyTap("k", pid int)
 func KeyTap(key string, args ...interface{}) error {
 	var keyArr []string
 
@@ -525,6 +530,7 @@ func KeyTap(key string, args ...interface{}) error {
 //	robotgo.KeyToggle("a", "up")
 //
 //	robotgo.KeyToggle("a", "up", "alt", "cmd")
+//	robotgo.KeyToggle("k", pid int)
 func KeyToggle(key string, args ...interface{}) error {
 
 	if len(key) > 0 && unicode.IsUpper([]rune(key)[0]) {
@@ -648,6 +654,7 @@ func inputUTF(str string) {
 // Examples:
 //
 //	robotgo.TypeStr("abc@123, Hi galaxy, こんにちは")
+//	robotgo.TypeStr("To be or not to be, this is questions.", pid int)
 func TypeStr(str string, args ...int) {
 	var tm, tm1 = 0, 7
 
diff --git a/key/keypress_c.h b/key/keypress_c.h
index 53dd3047..35c6d548 100644
--- a/key/keypress_c.h
+++ b/key/keypress_c.h
@@ -1,6 +1,16 @@
-#include "keypress.h"
+// Copyright 2016 The go-vgo Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// https://github.com/go-vgo/robotgo/blob/master/LICENSE
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
 #include "../base/deadbeef_rand_c.h"
 #include "../base/microsleep.h"
+#include "keypress.h"
 #include "keycode_c.h"
 
 #include <ctype.h> /* For isupper() */
@@ -17,6 +27,14 @@
 #if defined(IS_WINDOWS)
 	HWND GetHwndByPid(DWORD dwProcessId);
 
+	HWND getHwnd(uintptr pid, int8_t isPid) { 
+		HWND hwnd = (HWND) pid;
+		if (isPid == 0) { 
+			hwnd = GetHwndByPid(pid);
+		}
+		return hwnd;	
+	}
+
 	void WIN32_KEY_EVENT_WAIT(MMKeyCode key, DWORD flags, uintptr pid) {
 		win32KeyEvent(key, flags, pid, 0); 
 		Sleep(DEADBEEF_RANDRANGE(0, 1));
@@ -115,10 +133,8 @@ void win32KeyEvent(int key, MMKeyFlags flags, uintptr pid, int8_t isPid) {
 
 	// todo: test this
 	if (pid != 0) {
-		HWND hwnd = (HWND) pid;
-		if (isPid == 0) { 
-			hwnd = GetHwndByPid(pid);
-		}
+		HWND hwnd = getHwnd(pid, isPid);
+
 		int down = (flags == 0 ? WM_KEYDOWN : WM_KEYUP);
 		// SendMessage(hwnd, down, key, 0);
 		PostMessageW(hwnd, down, key, 0);
@@ -316,10 +332,7 @@ void unicodeType(const unsigned value, uintptr pid, int8_t isPid){
 		toggleUnicode(ch, false, pid);
 	#elif defined(IS_WINDOWS)
 		if (pid != 0) {
-			HWND hwnd = (HWND) pid;
-			if (isPid == 0) { 
-				hwnd = GetHwndByPid(pid);
-			}
+			HWND hwnd = getHwnd(pid, isPid);
 
 			// SendMessage(hwnd, down, value, 0);
 			PostMessageW(hwnd, WM_CHAR, value, 0);
diff --git a/window/alert_c.h b/window/alert_c.h
index d5ed2bae..290786d4 100644
--- a/window/alert_c.h
+++ b/window/alert_c.h
@@ -18,6 +18,7 @@ int showAlert(const char *title, const char *msg,
 		CFStringRef defaultButtonTitle = CFStringCreateWithUTF8String(defaultButton);
 		CFStringRef cancelButtonTitle = CFStringCreateWithUTF8String(cancelButton);
 		CFOptionFlags responseFlags;
+		
 		SInt32 err = CFUserNotificationDisplayAlert(
 			0.0, kCFUserNotificationNoteAlertLevel, NULL, NULL, NULL, alertHeader, alertMessage,
 			defaultButtonTitle, cancelButtonTitle, NULL, &responseFlags);
diff --git a/window/goWindow.h b/window/goWindow.h
index 6b69130e..cee4ed30 100644
--- a/window/goWindow.h
+++ b/window/goWindow.h
@@ -23,12 +23,8 @@ void min_window(uintptr pid, bool state, int8_t isPid){
 		XDismissErrors();
 		// SetState((Window)pid, STATE_MINIMIZE, state);
 	#elif defined(IS_WINDOWS)
-		if (isPid == 0) {
-			HWND hwnd = GetHwndByPid(pid);
-			win_min(hwnd, state);
-		} else {
-			win_min((HWND)pid, state);
-		}
+        HWND hwnd = getHwnd(pid, isPid);
+		win_min(hwnd, state);
 	#endif
 }
 
@@ -40,12 +36,8 @@ void max_window(uintptr pid, bool state, int8_t isPid){
 		// SetState((Window)pid, STATE_MINIMIZE, false);
 		// SetState((Window)pid, STATE_MAXIMIZE, state);
 	#elif defined(IS_WINDOWS)
-		if (isPid == 0) {
-			HWND hwnd = GetHwndByPid(pid);
-			win_max(hwnd, state);
-		} else {
-			win_max((HWND)pid, state);
-		}
+        HWND hwnd = getHwnd(pid, isPid);
+		win_max(hwnd, state);
 	#endif
 }
 
diff --git a/window/pub.h b/window/pub.h
index f38d4d44..2ab44625 100644
--- a/window/pub.h
+++ b/window/pub.h
@@ -267,6 +267,8 @@ typedef struct _Bounds Bounds;
 
 
 #elif defined(IS_WINDOWS)
+	HWND getHwnd(uintptr pid, int8_t isPid);
+	
 	void win_min(HWND hwnd, bool state){
         if (state) {
             ShowWindow(hwnd, SW_MINIMIZE);
diff --git a/window/win_sys.h b/window/win_sys.h
index 01edf012..776899b3 100644
--- a/window/win_sys.h
+++ b/window/win_sys.h
@@ -128,12 +128,7 @@ Bounds get_bounds(uintptr pid, int8_t isPid){
 
         return bounds;
     #elif defined(IS_WINDOWS)
-        HWND hwnd;
-        if (isPid == 0) {
-            hwnd= GetHwndByPid(pid);
-        } else {
-            hwnd = (HWND)pid;
-        }
+        HWND hwnd = getHwnd(pid, isPid);
 
         RECT rect = { 0 };
         GetWindowRect(hwnd, &rect);
@@ -193,12 +188,7 @@ Bounds get_client(uintptr pid, int8_t isPid) {
 		
 		return bounds;
 	#elif defined(IS_WINDOWS)
-		HWND hwnd;
-		if (isPid == 0) {
-			hwnd = GetHwndByPid(pid);
-		} else {
-			hwnd = (HWND)pid;
-		}
+		HWND hwnd = getHwnd(pid, isPid);
 
 		RECT rect = { 0 };
 		GetClientRect(hwnd, &rect);
diff --git a/window/window.h b/window/window.h
index 301129a8..35eaef5c 100644
--- a/window/window.h
+++ b/window/window.h
@@ -59,11 +59,7 @@ MData set_handle_pid(uintptr pid, int8_t isPid){
 		win.XWin = (Window)pid;  // Handle to an X11 window
 	#elif defined(IS_WINDOWS)
 		// win.HWnd = (HWND)pid;		// Handle to a window HWND
-		if (isPid == 0) {
-			win.HWnd = GetHwndByPid(pid);
-		} else {
-			win.HWnd = (HWND)pid;
-		}
+        win.HWnd = getHwnd(pid, isPid);
 	#endif
 
 	return win;