Anyone know the name of this utility?

[Lestat]

There was a windows untility programm I used to have that was great for multi-tabling. As soon as your mouse hovers over the window, that window becomes the priority window. So you don't have to click your mouse 2 or 3 times in order for that window to become active.

I can't for the life of me remember the name of this utility or where I got it. I've googled the heck out of it, but I'm probably using the wrong terminology. Can anyone provide a link or at least a name? Thanks.