So long as the unit you're trying to stream from with the Slingbox can be connected through component/composite cabling, you can attach and stream from just about anything; however, that doesn't mean a remote will be available. For example, if you were to hook up the PS3, you may be able to view whatever is already there, more than likely your settings/games/tv options, but you wouldn't be able to control it, so you would just be able to watch the background color shimmer and change (if you're using a default background anyways), but not much else.
Before anything, I would use this article to search the product you'll be trying to stream with and see if we have a default remote for it:
I hope this helps!!