>>>>Is there any setting to have this deferred writing turned off, or should I just close and reopen the target file every now and then?
>>>
>>>Uses you a buffered file ?
>>
>>Mmm... good idea. The source file is buffered. Didn't find any parameters in the fCreate() command that would influence any buffering, but then I could close it immediately after and do a fopen(cTargetFile, 11) (unbuffered, write-only). I'll see what this gives me.
>
>Dragan, Don't forget to post the result to me.

fFlush() wasn't even necessary... your idea to use unbuffered LL file operation was exactly what I needed. Works perfect.