"And another thing!..."

I frequently have the situation where I've been looking for something rare, find someone who's got it (and do Browse Host successfully on them) but then lose the 'shortcut' to them when I have to restart LW or the computer. Is there some method of bookmarking computers? Maybe, is their IP memorized along with any incomplete downloads? I realize that other people have to unload LW, too, just like me. So I guess what I'd like to see is something that allows me to continue to check if they're back on-line.