LoadData("debug.log")
{
    // opens file, batch number is 3
    LoadData("debug.log3")
    {
        // opens file, batch number is 2
        LoadData("debug.log2")
        {
            // opens file, batch number is 1
            LoadData("debug.log1")
            {
                // opens file, batch number is 0
                // begin loading data
            }
            // load data
        }
        // load data
    }
    // finish loading data
}