to make things easier check this out..
got it frm apple
http://docs.info.apple.com/article.html?artnum=302545
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If you have several MacBook Pro, iMac G5 (iSight), or Intel-based iMac computers, or other devices with integrated infrared ("IR") receivers in one room, you can "pair" your Apple Remote with a specific computer so it doesn't interfere with other iMac G5 (iSight) computers or IR devices nearby. (For example, maybe you have one or more iMac G5 (iSight) computers and a remote-controlled TV in the same room.)
Pairing allows you to set the receiving computer so that it can only be controlled by one remote. Here's how to pair your Apple Remote:
Pairing your remote with your Mac
Log in as an Admin user.
Get extra close to your Mac (about 3 or 4 inches away).
Point the remote at the Apple logo on the front of your Mac.
Press and hold the Menu and Next/Fast-forward buttons simultaneously on the remote for 5 seconds.
Your Apple Remote is now paired with your computer. You can tell the remote is paired because you will see a chain-link style lock.
To delete a pairing between the remote and your Mac, open System Preferences, click Security, and then click Unpair in the Security pane. (You may have to enter your Administrator password to make changes in the Security pane.)
Turning off infrared reception
You can use the Security pane in System Preferences to turn the infrared ("IR") reception on your Mac off (or back on). To do this:
From the Apple menu, choose System Preferences.
Click Security to display the pane.
Select the "Disable remote control infrared receiver" checkbox.
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