Florian Pose <fp@igh-essen.com> [Wed, 29 Jul 2009 09:19:53 +0000] rev 1513
Re-added callback data pointer, because it is necessary for some applications.
Florian Pose <fp@igh-essen.com> [Tue, 28 Jul 2009 16:06:21 +0000] rev 1512
Fixed typos.
Florian Pose <fp@igh-essen.com> [Tue, 28 Jul 2009 15:42:43 +0000] rev 1511
TODO.