public function SetStatus($name, $status)
{
    $fp = $this->PrvOpen();
    $fdata = fread($fp, filesize($this->path));
    echo("SetStatus: fdata in: $fdata<br/>");
    $allTasks = unserialize($fdata);
    $allTasks[$name] = $status;
    $this->PrvClear($fp);
    $fdata = serialize($allTasks);
    echo("SetStatus: fdata out: $fdata<br/>");
    $dataLength = mb_strlen($fdata);
    echo("SetStatus: data length: $dataLength<br/>");
    $truncResult = ftruncate($fp, mb_strlen($fdata));
    echo("SetStatus: truncate result: $truncResult<br/>");
    $seekResult = fseek($fp, 0, SEEK_SET);
    echo("SetStatus: seek result: $seekResult<br/>");
    $cnt = fwrite($fp, $fdata);
    echo("SetStatus: count written: $cnt/" . mb_strlen($fdata) . "<br/>");
    $flushResult = fflush($fp);
    echo("SetStatus: flush result: $flushResult<br/>");
    $fpos = ftell($fp);
    echo("SetStatus: file position: $fpos<br/>");
    echo("SetStatus: filesize before close: " . filesize($this->path) . "<br/>");
    $this->PrvClose($fp);
    echo("SetStatus: filesize after close: " . filesize($this->path) . "<br/>");
}