How do I create a VB application that controls other hardware?

OK, the deal is I want to create an application that will control either my digital remote control or my light switch. Creating the buttons in VB is really easy but when it comes to the underlying functionality, I get stuck! What should I do?How do I create a VB application that controls other hardware?
The easiest way to do this is to get some specialized device that hooks up to your PCI slots or your serial port to control the things that you want and includes a VB library. PCI cards are fast an expensive (http://www.ni.com or http://www.web-tronics.com)



Serial port (or USB serial adapater) boards are slower but cheaper (http://www.awce.com/gp3.htm).