[ns] Doubts about Scheduler class

[A Anupama]

Hi,
        I am doing some modifications to AODV protocol. In the sendRequest
method, there is a line:

 Scheduler::instance().schedule(target_, p, 0.);

where p is the request packet created.  I think, this line is to send the
packet. But, I am not sure... Can any one tell me how actually a packet is
sent ?
If I have my own packet, say some neighbor solicitation, how can I send the
packet ? Is there any direct method to send a packet ?

Thanks in advance.

Regards
Anupama