Please read wiki artlicle at wesite below.
http://en.wikipedia.org/wiki/Bluetooth
I can explain anything you don't understand. The artticle says that depending on the bluetooth driver you are using (I copied the specific section below) the code may be different.
At any given time, data can be transferred between the master and one other device
(except for the little-used broadcast mode[citation needed]). The master chooses
which slave device to address; typically, it switches rapidly from one device to
another in a round-robin fashion. Since it is the master that chooses which slave
to address, whereas a slave is (in theory) supposed to listen in each receive slot,
being a master is a lighter burden than being a slave. Being a master of seven
slaves is possible; being a slave of more than one master is difficult.
[citation needed] The specification is vague as to required behaviour in scatternets.
jdweng
