What's the difference between begin and and fragment on a topic info?
Having begin fragment: "doA()" and end fragment: "doB()" is equivalent with end fragment (or begin): "doA() [enter] doB()"?
CK wiki says only something about timing but from that I still understand that they'll both end up running when the topic is played...

Can someone give an example when you have to use begin, when end, when both and doing it differently would be wrong?