the multi interface, but having the comment in here caused more questions than
we fixed problems so I remove it now. It still works fine.
If you transfer data with the multi interface, this function will not be
called during periods of idleness unless you call the appropriate libcurl
-function that performs transfers. Usage of the \fBCURLOPT_PROGRESSFUNCTION\fP
-callback is not recommended when using the multi interface.
+function that performs transfers.
\fICURLOPT_NOPROGRESS\fP must be set to FALSE to make this function actually
get called.