[Tinyos-help] receive msg

[dima .]

hello plz i have 2 questions when sending a message and receiving it 
 
1-like in this command the message being sent is it pmsg? or it is ret=msg ???
 
event TOS_MsgPtr ReceiveCmdMsg.receive(TOS_MsgPtr pmsg){    TOS_MsgPtr ret = msg;    result_t retval;      retval = call ProcessCmd.execute(pmsg) ;    if (retval==SUCCESS) {      return ret;    } else {      return pmsg;    }
 
if the retval ==success the command return ret (=msg) is it the message that we are trying to send and receive ??
 
 
thx 
 
else the event return pmsg ,what does it refers to ?
 
thx alot 
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