The acronymn is actually written IrDA, but it seems that some who post to these fourms have defective keyboards with inoperable shift keys.
IrDA is a ''wireless'' connection that does not use radio techniques. It is, of course, limited to relatively short ranges, and must be line-of-sight. It is generally used to connect appropriate keyboards, mice, printers, etc. to a system -- especially when you desire security levels better than that of broadcast signals. It can also be used in environments where systems are so close together that a radio signal from one system is picked up by another. (Imagine the chaos if your computer responded to your officemate's keystrokes.)
Some things are being done with regard to using a TV remote with a computer. Go to
and search on control computer with TV remote to learn more.