The IR Blaster for your Slingbox will broadcast the same signal on all three of its leads. So, there's no way to physcially seperate them. However, some set-top boxes allow you to setup an address for the set-top box and the remote. This will allow multiple set-top boxes in the same area to only respond to a remote with the same address. I'm afraid this is the only way you could put the same boxes on one Slingbox and control them seperately. So, if your set-top box doesn't offer this ability then you'll probably need to get a seperate Sligbox.