Things have gotten a long way from the original question...
Whew!
I do not think that we need to get into a technical terminology discussion. That is pretty much irrelevant to the task at hand.

I want to build a tcp session between my computer and a remote server using specific port, and read data from the remote server.

You need to look for a spec on how this communication works. You should be looking for a description of the sequence of stuff that you need to send to the server and the sequence of stuff that the server will send back to you.

If you are lucky, there is already some Perl module written that will do all of this. But, without knowing what specifically what that server application is and what data you expect back there is no way that I advise further. Just saying that I want a TCP/IP connection is just not nearly enough!