diff --git a/0.73_My_PuTTY/putty.h b/0.73_My_PuTTY/putty.h
index c259f70..feec756 100644
--- a/0.73_My_PuTTY/putty.h
+++ b/0.73_My_PuTTY/putty.h
@@ -1178,6 +1178,7 @@ struct TermWinVtable {
     void (*set_cursor_pos)(TermWin *, int x, int y);
 
     void (*set_raw_mouse_mode)(TermWin *, bool enable);
+    void (*set_focus_reporting_mode)(TermWin *, bool enable);
 
     void (*set_scrollbar)(TermWin *, int total, int start, int page);
 
@@ -1234,6 +1235,8 @@ static inline void win_set_cursor_pos(TermWin *win, int x, int y)
 { win->vt->set_cursor_pos(win, x, y); }
 static inline void win_set_raw_mouse_mode(TermWin *win, bool enable)
 { win->vt->set_raw_mouse_mode(win, enable); }
+static inline void win_set_focus_reporting_mode(TermWin *win, bool enable)
+{ win->vt->set_focus_reporting_mode(win, enable); }
 static inline void win_set_scrollbar(TermWin *win, int t, int s, int p)
 { win->vt->set_scrollbar(win, t, s, p); }
 static inline void win_bell(TermWin *win, int mode)
@@ -1384,6 +1387,7 @@ NORETURN void cleanup_exit(int);
     X(BOOL, NONE, no_applic_c) /* totally disable app cursor keys */ \
     X(BOOL, NONE, no_applic_k) /* totally disable app keypad */ \
     X(BOOL, NONE, no_mouse_rep) /* totally disable mouse reporting */ \
+    X(BOOL, NONE, no_focus_rep) /* totally disable mouse reporting */ \
     X(BOOL, NONE, no_remote_resize) /* disable remote resizing */ \
     X(BOOL, NONE, no_alt_screen) /* disable alternate screen */ \
     X(BOOL, NONE, no_remote_wintitle) /* disable remote retitling */ \
diff --git a/0.73_My_PuTTY/settings.c b/0.73_My_PuTTY/settings.c
index abb60b5..55acd3a 100644
--- a/0.73_My_PuTTY/settings.c
+++ b/0.73_My_PuTTY/settings.c
@@ -649,6 +649,7 @@ void save_open_settings(settings_w *sesskey, Conf *conf)
     write_setting_b(sesskey, "NoApplicationKeys", conf_get_bool(conf, CONF_no_applic_k));
     write_setting_b(sesskey, "NoApplicationCursors", conf_get_bool(conf, CONF_no_applic_c));
     write_setting_b(sesskey, "NoMouseReporting", conf_get_bool(conf, CONF_no_mouse_rep));
+    write_setting_b(sesskey, "NoFocusReporting", conf_get_bool(conf, CONF_no_focus_rep));
     write_setting_b(sesskey, "NoRemoteResize", conf_get_bool(conf, CONF_no_remote_resize));
     write_setting_b(sesskey, "NoAltScreen", conf_get_bool(conf, CONF_no_alt_screen));
     write_setting_b(sesskey, "NoRemoteWinTitle", conf_get_bool(conf, CONF_no_remote_wintitle));
@@ -1191,6 +1192,7 @@ void load_open_settings(settings_r *sesskey, Conf *conf)
     gppb(sesskey, "NoApplicationKeys", false, conf, CONF_no_applic_k);
     gppb(sesskey, "NoApplicationCursors", false, conf, CONF_no_applic_c);
     gppb(sesskey, "NoMouseReporting", false, conf, CONF_no_mouse_rep);
+    gppb(sesskey, "NoFocusReporting", false, conf, CONF_no_focus_rep);
     gppb(sesskey, "NoRemoteResize", false, conf, CONF_no_remote_resize);
     gppb(sesskey, "NoAltScreen", false, conf, CONF_no_alt_screen);
     gppb(sesskey, "NoRemoteWinTitle", false, conf, CONF_no_remote_wintitle);
diff --git a/0.73_My_PuTTY/terminal.c b/0.73_My_PuTTY/terminal.c
index 67aea3b..647123c 100644
--- a/0.73_My_PuTTY/terminal.c
+++ b/0.73_My_PuTTY/terminal.c
@@ -1530,6 +1530,7 @@ void term_copy_stuff_from_conf(Terminal *term)
     term->no_applic_k = conf_get_bool(term->conf, CONF_no_applic_k);
     term->no_dbackspace = conf_get_bool(term->conf, CONF_no_dbackspace);
     term->no_mouse_rep = conf_get_bool(term->conf, CONF_no_mouse_rep);
+    term->no_focus_rep = conf_get_bool(term->conf, CONF_no_focus_rep);
     term->no_remote_charset = conf_get_bool(term->conf, CONF_no_remote_charset);
     term->no_remote_resize = conf_get_bool(term->conf, CONF_no_remote_resize);
     term->no_remote_wintitle = conf_get_bool(term->conf, CONF_no_remote_wintitle);
@@ -2737,6 +2738,9 @@ static void toggle_mode(Terminal *term, int mode, int query, bool state)
             term->xterm_mouse_mode = state ? MM_ANY_EVENT : MM_NONE;
             win_set_raw_mouse_mode(term->win, state);
             break;
+          case 1004:
+            win_set_focus_reporting_mode(term->win, state);
+            break;
           case 1005:                   /* use XTERM 1005 mouse protocol */
             term->xterm_mouse_protocol = state ? MP_XTERM : MP_NORMAL;
             break;
@@ -7764,7 +7768,16 @@ void term_provide_logctx(Terminal *term, LogContext *logctx)
 
 void term_set_focus(Terminal *term, bool has_focus)
 {
-    term->has_focus = has_focus;
+    if( term->has_focus != has_focus) {
+        term->has_focus = has_focus;
+
+        if(term->report_focus && term->ldisc) {
+            if (has_focus)
+                ldisc_send(term->ldisc, "\033[I", 3,false);
+            else
+                ldisc_send(term->ldisc, "\033[O", 3,false);
+        }
+    }
     term_schedule_cblink(term);
 }
 
diff --git a/0.73_My_PuTTY/terminal.h b/0.73_My_PuTTY/terminal.h
index 2896e2d..6582fa4 100644
--- a/0.73_My_PuTTY/terminal.h
+++ b/0.73_My_PuTTY/terminal.h
@@ -331,6 +331,8 @@ struct terminal_tag {
     bool no_applic_k;
     bool no_dbackspace;
     bool no_mouse_rep;
+    bool no_focus_rep;
+    bool report_focus;
     bool no_remote_charset;
     bool no_remote_resize;
     bool no_remote_wintitle;
diff --git a/0.73_My_PuTTY/windows/window.c b/0.73_My_PuTTY/windows/window.c
index a8d2531..1bed26f 100644
--- a/0.73_My_PuTTY/windows/window.c
+++ b/0.73_My_PuTTY/windows/window.c
@@ -382,6 +382,7 @@ static int wintw_char_width(TermWin *, int uc);
 static void wintw_free_draw_ctx(TermWin *);
 static void wintw_set_cursor_pos(TermWin *, int x, int y);
 static void wintw_set_raw_mouse_mode(TermWin *, bool enable);
+static void wintw_set_focus_reporting_mode(TermWin *, bool enable);
 static void wintw_set_scrollbar(TermWin *, int total, int start, int page);
 static void wintw_bell(TermWin *, int mode);
 static void wintw_clip_write(
@@ -414,6 +415,7 @@ static const TermWinVtable windows_termwin_vt = {
     wintw_free_draw_ctx,
     wintw_set_cursor_pos,
     wintw_set_raw_mouse_mode,
+	wintw_set_focus_reporting_mode,
     wintw_set_scrollbar,
     wintw_bell,
     wintw_clip_write,
@@ -2021,6 +2023,24 @@ static void wintw_set_raw_mouse_mode(TermWin *tw, bool activate)
     update_mouse_pointer();
 }
 
+/*
+ * set or clear the "window focus messages" mode
+ */
+static void wintw_set_focus_reporting_mode(TermWin *tw, bool activate)
+{
+	activate = activate && !conf_get_bool(conf, CONF_no_focus_rep);
+
+	if (activate != term->report_focus)
+	{
+		term->report_focus = activate;
+		//send first activation notification message
+		if (activate)
+		{
+			SendKeyboard(hwnd, "\033[I");
+		}
+	}
+}
+
 /*
  * Print a message box and close the connection.
  */
diff --git a/kitty_savedump.c b/kitty_savedump.c
index fe2cb25..1cad51c 100644
--- a/kitty_savedump.c
+++ b/kitty_savedump.c
@@ -331,6 +331,7 @@ void SaveDumpConfig( FILE *fp, Conf * conf ) {
 	fprintf( fp, "no_applic_c=%d\n", 		conf_get_bool(conf,CONF_no_applic_c) ) ;
 	fprintf( fp, "no_applic_k=%d\n", 		conf_get_bool(conf,CONF_no_applic_k) ) ;
 	fprintf( fp, "no_mouse_rep=%d\n", 		conf_get_bool(conf,CONF_no_mouse_rep) ) ;
+	fprintf( fp, "no_focus_rep=%d\n", 		conf_get_bool(conf,CONF_no_focus_rep) ) ;
 	fprintf( fp, "no_remote_resize=%d\n", 		conf_get_bool(conf,CONF_no_remote_resize) ) ;
 	fprintf( fp, "no_alt_screen=%d\n", 		conf_get_bool(conf,CONF_no_alt_screen) ) ;
 	fprintf( fp, "no_remote_wintitle=%d\n", 	conf_get_bool(conf,CONF_no_remote_wintitle) ) ;
diff --git a/kitty_settings.c b/kitty_settings.c
index c76fa0b..2d73dc8 100644
--- a/kitty_settings.c
+++ b/kitty_settings.c
@@ -155,6 +155,7 @@ void save_open_settings_forced(char *filename, Conf *conf) {
     write_setting_b_forced(sesskey, "NoApplicationKeys", conf_get_bool(conf, CONF_no_applic_k));
     write_setting_b_forced(sesskey, "NoApplicationCursors", conf_get_bool(conf, CONF_no_applic_c));
     write_setting_b_forced(sesskey, "NoMouseReporting", conf_get_bool(conf, CONF_no_mouse_rep));
+    write_setting_b_forced(sesskey, "NoFocusReporting", conf_get_bool(conf, CONF_no_focus_rep));
     write_setting_b_forced(sesskey, "NoRemoteResize", conf_get_bool(conf, CONF_no_remote_resize));
     write_setting_b_forced(sesskey, "NoAltScreen", conf_get_bool(conf, CONF_no_alt_screen));
     write_setting_b_forced(sesskey, "NoRemoteWinTitle", conf_get_bool(conf, CONF_no_remote_wintitle));
@@ -690,6 +691,7 @@ void load_open_settings_forced(char *filename, Conf *conf) {
     gppb_forced(sesskey, "NoApplicationKeys", false, conf, CONF_no_applic_k);
     gppb_forced(sesskey, "NoApplicationCursors", false, conf, CONF_no_applic_c);
     gppb_forced(sesskey, "NoMouseReporting", false, conf, CONF_no_mouse_rep);
+    gppb_forced(sesskey, "NoFocusReporting", false, conf, CONF_no_focus_rep);
     gppb_forced(sesskey, "NoRemoteResize", false, conf, CONF_no_remote_resize);
     gppb_forced(sesskey, "NoAltScreen", false, conf, CONF_no_alt_screen);
     gppb_forced(sesskey, "NoRemoteWinTitle", false, conf, CONF_no_remote_wintitle);