connecting two computers via crossover cable?

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Does this mean I could send/recive from each PC without there being any form on internet connection? like I could send a file to one PC even if both were disconnected from the network? or does there need to be some form of network connection? this tutorial seems to give the impression there needs to be some connection.. but I don't see the point in using a crosswover cable if both are connected to the network I could just map a networkdrive or something..

http://ccm.net/faq/6340-connect-pcs-using-a-crossover-ethernet-cable

 

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A null modem cable used to allow basic comms over a serial port, now its mainly used to connect to appliances to diagnose them.

Ethernet cards are cheap and TCP/IP is now ubiquitous, so yes its easier to create a peer to peer network using these technologies now.

Null modem or Cat5, its still two wires, one transmit, one receive.

 

yeh you can connect network cards straight too each other with a crossover lead, or use a switch to plug the cards into to make a network of multiple devices

Null modem, reminds me of the old days with DOS interlink (or playing F29 Retaliator across 2 PCs lol). Like dmarsh said, serial is mainly used to connect to devices to log into them (like switches,routers etc)