ACTUALLY the cat helps alot, even without the straight answers, but hes right, it doesn't sound like you know what you are doing or want to do, switching a "bit" is simple, but you still need to consider what you are switching(relays,ect), encryption, transmission/reception method, so if you want multiple devices, or a sign in your window, you may be taking on too much as a newb, depends on how you want to do it,and wat u kno , ,
you can get a bluetooth TX/RX chip for 10$ somewhere, if you can write to rs232 communications
if you really just want an simple I/O sw just get simple transmitter/receiver circuit