plz plz

i wanted to control a devices like fan or light, using mcu and the signal will be receive by the mcu came from the pc ,in the serial port.......but i dont know how to prog it for serial port to detect...
plz plz

i wanted to control a devices like fan or light, using mcu and the signal will be receive by the mcu came from the pc ,in the serial port.......but i dont know how to prog it for serial port to detect...
plz

how to write a program for COM Port
plz

how to write a program for COM Port
plz explain!!

Thank you sir...... But can u clarify me whats the difference between port P0 and pins of P0 I maen when we see the output of my program in port P0 we have two things: P0: pins: Whats does both...