Back when playing Ultima Online there used to be a program we used when macroing to monitor the situation even when doing other things on the computer (this was back when most people had a CRT and before multi display setups being common-ish) that would let you select a rectangle in one process and then it would pop-up an always-on-top movable borderless window that just showed that selection, even if the game was behind your browser window etc. Was really handy for multitasking and I'm now stuck with one monitor and this could be handy to get Fishtank with no extra fluff around it obstructing my other activities. Can't think of what keywords to use to look for it, last time I used it was in the 00s, does anyone know such a thing?