connectors look like, so that you can check the rear of your computer.
On a PC Game that i play there r multiple ways to connect and play against other humans. One is "direct cable connection" and it says that i need a "null-modem cable that connects the computers by a free serial port on each computer." 2 questions, what is the serial port and what is a null-modem cable? Also where would i buy a "null-modem" cable?