TCP sockets: NO_DELAY

Hi,
I am new to sockets, and I am trying to write a simple TCP socket using
C/C++.
I noticed that I can use TCP_NODELAY as an option for my socket to
force sending a packet. However, I have a few comments and questions
that I would like to clear:
1. the NO_DELAY option is set on the client side. Is this correct? or I
need it on both sides?
2. I am also getting the '@' character every once in a while. I don't
know what is causing it.

All my code is doing is sending short strings and on the host side I am
displaying those strings. Nothing more... but I would like to use them
as burst data rather than waiting for TCP to buffer then send.

.

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