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f := FileOpen("C:\Windows\System32\dwm.exe","r","CP0")
	if !IsObject(f)
		MsgBox 0
MsgBox % FileExist("C:\Windows\System32\dwm.exe")

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; Return array of keys if exist
HasValue(var, arr) {
	arrOfKeys := {}
	for key, value in arr
		if (value == var)
			arrOfKeys.Push(key)
	return (arrOfKeys.Length() = 0) ? false : arrOfKeys
}

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Rbutton & Lbutton::ToolTip 1
Rbutton UP::ToolTip % A_PriorKey
Esc::ExitApp

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#Persistent
Global Stop_f_loop := false
SetTimer f, -1
Return

F1::Stop_f_loop := true

F2::
Stop_f_loop := false
SetTimer f, -1
Return

f() {
	static i := 0
	MsgBox % ++i
	If Not Stop_f_loop
		SetTimer f, -1
}