David,

As well as what Vlad has said, this practice is helpfull if one ever wants to implement a chain of responsibility for errors. In the chain the object that received the error would start the chain and then each object in the containership would be passed the error until an object handled it. The return .F. is signifying that the error event did NOT handle the error situation, so any chain would then pass the problem on to the next object. If any error event returns .T. the process ends as the error has been handled.

JimB