About the task

[foolpcman]

In my opinion,single task will do all the work(e.g:setActors,)in the task-node,When will you use multi-task?
Sorry,my english isn't well

[foolpcman]

Sorry,I mean that ,What 's the use of creating more than one task in task-node?

[kukeltje]

if you have multiple strongly related but different tasks

You could also model this as a fork with three tasknodes each with one task, but this is more 'convenient'