number one you need to establish what your wireless link will be. For simple projects, I use Linx products, which can be found on their website (linxtechnologies.com) or at digikey.
Next, you need to decide what your pc interface will be, serial port, usb port, or parallel port. The code you write on the pc will be dependent on where you input your data.
The design of the transmitter device will be dependent on the receiver to the pc. Linx has FOB devices that send an address, and an address decoder that initializes an interupt via the parallel port might be all that is needed. You can make your interface as simple or as complex as you want, but by your description, you need two way communication, as your remote device has to show it received confirmation by the pc. you may need a transmitter/receiver at both ends. In that case, they also make bluetooth devices that plug into a pc.