for a project i'm working on, i'm building an application that has to communicate
with a Yun. I would like to do this with serial communication over TCP/IP.
Since it works on the Arduino IDE, i was wonder how i could program a serial monitor
that works over IP instead of a COM port.
Look at the examples that come with the ethernet library. It will show you how to send/receive messages. On your PC, you can use freely available communication software like Putty ( link) as your "monitor"