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how to switch on an and off a LED from my PC through RS232 ?

hello guys,
i want to switch on an and off a LED from my PC through RS232.
i have developed a program in java which writes on to the RS232 port.can you help me with the circuits?? because i have zero knowledge of the circuit connection
i would want to build on this project phase by phase like:
1. making the one way on and off to a two sided(i.e. if i press a button on the circuit outside i get a message pop on my program telling what ever message)
2. converting it to a wireless.
3. then think about the micro controllerslike wise..
thank you guys in advance.
bye

Just put a little microcontroller on the end of the wire now.
Re-design7 years ago
<a href="http://www.beyondlogic.org/serial/serial.htm">This will tell you everything you want to know about it.</a><br />