#include <Misc.au3>
Local $hDLL = DllOpen("user32.dll")

$del = send("{backspace}")


Local $hFile = FileOpen(@ScriptDir & "\log.txt", 2)
$file = FileRead($hFile)
while 1
  If _IsPressed("08", $hDLL) Then
   $f = StringTrimRight($file, 1)
   FileWrite($hFile, $f")
   else
   EndIf
   sleep(500)
  WEnd