Sending keyboard event to special running application

Hi, i'm trying to writing application that sending keyboard event to running application. The code below are send to any application that am viewing, I want it send only to special application.
Hope to get some hint or example at here, thank you for reading

#Region func
Func start()
If $start = False Then
  If GUICtrlRead($txtdelay[8]) == "" Then
   MsgBox(0, "Error", "Input this form first")
   GUICtrlSetBkColor($txtdelay[8], 16711680)
  Else
   GUICtrlSetBkColor($txtdelay[8], 16777215)
   $start = True
   WinSetTitle($hwnd, "", "Auto started ...")
   For $i = 1 To 8
	$timestart[$i] = 0
	GUICtrlSetState($txtskill[$i], $gui_disable)
	GUICtrlSetState($txtdelay[$i], $gui_disable)
   Next
  EndIf
Else
  GUICtrlSetBkColor($txtdelay[8], 16777215)
  $start = False
  WinSetTitle($hwnd, "", "Auto paused ...")
  For $i = 1 To 8
   GUICtrlSetState($txtskill[$i], $gui_enable)
   GUICtrlSetState($txtdelay[$i], $gui_enable)
  Next
EndIf
EndFunc
Func quit()
WinSetTitle($hwnd, "", "My Auto")
Exit
EndFunc
#EndRegion func
While 1
$nmsg = GUIGetMsg()
Switch $nmsg
  Case $gui_event_close
   WinSetTitle($hwnd, "", "My Auto")
   Exit
EndSwitch
If $start = True Then
  For $i = 1 To 8
   If GUICtrlRead($txtdelay[$i]) <> "" AND GUICtrlRead($txtdelay[$i]) <> "" Then
	If $timestart[$i] == 0 Then
	 $timestart[$i] = TimerInit()
	Else
	 $timediff[8] = TimerDiff($timestart[8])
	 If $timediff[8] >= (GUICtrlRead($txtdelay[8]) * 1000) Then
	  ControlSend($hwnd, "", "", "p")
	  Sleep(2000)
	  ControlSend($hwnd, "", "", "p")
	  Sleep(2000)
	  ControlSend($hwnd, "", "", "p")
	  Sleep(2000)
	  ControlSend($hwnd, "", "", "p")
	  Sleep(2000)
	  $timestart[8] = TimerInit()
	 Else
	  $timediff[$i] = TimerDiff($timestart[$i])
	  If $timediff[$i] >= (GUICtrlRead($txtdelay[$i]) * 1000) Then
	   ControlSend($hwnd, "", "", GUICtrlRead($txtskill[$i]))
	  EndIf
	 EndIf
	EndIf
   EndIf
  Next
EndIf
WEnd