[Tinyos-help] HELP on tinyos-1.x

[Amir]

Hello friends,

Can anyone explain to me the difference between these two declarations
Comm.SendMsg[AM_MSG];
Comm.ReceiveMsg[AM_MSG];

and

Comm.SendMsg;
Comm.ReceiveMsg;

I cannot comprehend why the former declaration is needed. I saw some codes
using it but cant figure out why? I would be pleased if anyone explains it
to me.
I would really appreciate the effort.

Thanking You
Amir
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