need help on ImageSearch

[msavatar]

hello guys

im new in autoit 

and i want ask for ImageSearch

code

 

#include <ImageSearch.au3>

HotKeySet("p", "checkForImage")

global $y = 0, $x = 0

Func checkForImage()
Local $search = _ImageSearch('checkImage.bmp', 0, $x, $y, 0)
If $search = 1 Then
MouseMove($x, $y, 10)
EndIf
EndFunc

while 1
sleep(200)
WEnd

i Need ask 

1-  can make code serch on client or any window under active window or no ?

2- when start script he serch on image just one time when start  ( can make image serch avery 3 mint ?

sry for my bad english