u assign a <b>callback</b>, the <b>event</b> will be ignored.<br>
If you assign an <b>event</b>, the <b>callback</b> will be ignored.<br>
<br>
If you don't specify any input or output handlers or filenames, 
tCurl will expect to use the standard input or output of the current console.
 This may cause problems with form-based Delphi applications, where a standard console is not available. <br>
<br>
If you assign a <b>callback</b>, the <b>filename</b> will be ignored.
In this case your callback is responsible