This probbaly has been asked thousands of time... but i''ve never read this forum before so i''ll ask again! How do i send and recieve data between 2 computers? Does it works in diffrent ways if its two computer in a LAN or over the internet?

Get reading!

http://www.gamedev.net/reference/list.asp?categoryid=30

omg! this wans''t as easy as i thought

or maybe its just because I''m so tired i dont understand anything

Take a look at this if you want (the example). It shows how to connect two machines (although you can run the client & server on the same machine), but theres a problem with my sending and recieving: the client only recieves one message. But it shows you the basics.

To answer your other question, theres no difference between connecting over a modem, LAN, Internet, loopback, whatever at your level. There is lower down, at the internal sockets layer, but theres nothing to concern yourself with there.