$Userstart = Inputbox("Test", "Start:")
$Userend = Inputbox("Test", "End:")
Func Dummy($i)
    If Random (0, 1, 1) = 1 Return True
    Return False
EndFunc
$current = $Userstart
Do
    $test = Dummy($current)
    $current += 1
Until $test Or $current > $Userend