Get input from ports and send output

[AgentX4000]

I'm learning C++. Is there some way to make program function on input from a port like usb port and can I send bits through the port? For example A usb cable connected to a circuit. I press a button and an AND gate on the circuit gets activated by a bit from the usb port and a fan in the room turns on.

[mutexe]

For windows:
http://msdn.microsoft.com/en-us/library/windows/hardware/ff540196(v=vs.85).aspx
example:
http://msdn.microsoft.com/en-us/library/windows/hardware/ff540174(v=vs.85).aspx