If the 800x600 is on the right and a window opens in it, you can alt-tab to it or click it on the taskbar, then just hit win+leftarrow until it appears on the correct monitor. Same for win+rightarrow if other way around. Should not need to IKVM
For example, when starting KeePass by opening a .kdbx password safe file, KeePass will first open the master password input modal pop-up.
If that happens on a turned-off screen (IMHO it opens on the screen on which the KeePass main window was placed before the process exited on the previous run), you'll be lost.
Very frustrating, e.g. for multi-screen home theater setups.
Anyone please share your solutions to this problem.