I know someone will simply say use the search button, but searching for all the common things like "how to" simply yeilds no results so I'll help you out with a link

http://www.dual-boxing.com/wiki/inde...etting_started

That wiki page is a great place to start, about 2/3s the way down the page you'll see a question about software or hardware multiboxing. If you click the software link (I'm assuming you would prefer software based on your inquiry) it will have a nice chart detailing the abilities and cost of several common programs used for multiboxing. Once you choose a software solution that meets your needs, you can usually find quite a bit of info on the designers website and through searches using the search bar with the name of the software used as the search term.

Good luck and welcome to the addiction...