API TX request frame

Hi,

I am trying to creat point to multipoint network using 900HP (fw-8068).
I have set of commands that coordinator (non-sleeping) sents to non-routing nodes.
My question is when I am using TX request API with unicast message , I do receive correct delivery messages that is either sucessful or fail. But when I am sending broadcast message I do receive successful transmision delivery message even though there is no end nodes. Does coordinator send itself a reply?
In extension to above question, how long this message will be broadcasted ? I mean how many broadcast are sent and for how long(time) ? Is there a command that controls it?

Regards,
Pathik

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